I hope you guys enjoyed this video. If you want to learn even more, I hope you'll consider checking out my Amazon #1 Bestselling book, DIY Lithium Batteries, available in paperback and ebook formats. a.co/iDtWdPX
Thanks for your informative videos I just bought a SM8124A internal resistance meter. Many used 18650 cells read around 30 some around 100 or more and the levels seem stable. Many read a rapidly changing reading between 25 and 60 can you give us a video explaining proper expected readings.
Friendly advice: Don't do it 4-5 times in a row. Check that video with thermal camera and comparison of spot welding and soldering. Even if you spot weld it gets some heat into the battery. It is better to spot weld once and then move to the next tab and do it in circles. This will give the battery chance to cool down a little bit.
the whole point of a spotwelder is that it stops the cell from even heating up in the first place, id only do what you said if I was soldering cells together
nah, I worked in a factory spot welding on these exact cells for four years straight in college. You just work on one cell and move one, never in four years was there a problem due to what you're describing. Few small issues were when the strap touched or welded in the wrong spot...keep a bucket of sand near by and a fire suppressant.
dude. LOVE THIS! thank you so much. I want to build a custom electric scooter because everything on the market right now just isn't fast enough for what I want
Hi, good content. I used to work for a company who manufactured battery Pack a good way to make sure the solder stays on nikel plate is to scratch it (nickel plate) with a blade, it helps solder stick better.
I've gotten tons of questions about where I got these materials. Everything can be found here: 18650 cells: goo.gl/tVjREI Nickel strip: goo.gl/VIrNQq Spot welder: goo.gl/cZS1yC BMS: goo.gl/S6gSQx Silicone wire: goo.gl/xmpbKD Black 18650 cell spacers: goo.gl/hQxWF6 Large heat shrink tubing: goo.gl/6v1ow9 Foam sheet for protecting battery: goo.gl/5e71tE
Hi will these batteries work, i'm not sure because they are a lot cheaper than the other ones on ebay. www.ebay.com.au/itm/Brand-Tikon-3-7V-Rechargeable-18650-Li-ion-Lithium-Battery-Cell-Fr-Flashlight-OZ-/331328395337?var=&hash=item4d24b61849:m:mrpIJrj1oWd5miqvwQUBOXA
Hi there , Great video I'm planning on building an Ebike and I was wondering if these are a decent battery www.alibaba.com/product-detail/Hot-sale-hight-quanlity-3-7V_60169974596.html?spm=a2700.7724838.0.0.mpG9Mi
Pancake - No, I'm sorry but these aren't so good for ebike use. They cheaper chinese cells and are of questionable quality. These work fine for flashlights, but aren't appropriate for high power devices like ebikes.
Richie, sorry I thought I had tagged that. I was referring to Pancakes. Now I see yours. Those look like either knock offs of Samsung 26F cells (perfectly good but low power cells) or they are genuine but the vendor doesn't have the rights to sell them so they aren't showing the label with cell info. If they are knock offs then they are only as good as the average cheap chinese cell (not very good). If they are genuine, then they are just fine but you'll need to use enough in parallel to cover your current needs since they are low power cells rated for max 5A draw each.
Really really really great video. Calm, clear voice with no annoying pretend excitement. I might retire in S. America and, while I love my Haibike MTB, Bosch ebike systems aren't serviced there - I believe. Now I'm confident I can convert a bike to electric and service it myself. Thanks!
Power = Voltage x Current W = 3.7V x 20A W = 74 Energy = Voltage x Current x time W time = V x I x time W hour = 3.7V x [3000 mAh] W hour = 3.7V x 3 Ah Wh = 11.1 That simple. And for reference, 1000 Wh = 1 kWh [1 Electrical Unit], which is what our kWh energy meter uses in home ________________________________ mAh and Ah which are seriously flawed unit (which doesn't take voltage into account), which is normally used by manufacturers and marketers to misguide people !! Professional and universal unit for energy are, kWh or Wh. I mean, these all of us use kWh meter in home, kWh in Tesla car, and 1000 Wh = 1 kWh. (how else simple do you want ??) Still people use mAh and Ah, wonder how lame can they get !!! And for comparison (different rechargeable battery types): AAA [NiMH] = 1 Wh AA [NiMH] = 2.5 Wh AA [Li ion] = 3 Wh C [NiMH] = 5 Wh D [NiMH] = 10 Wh 18650 [Li ion] = 8 to 13 Wh (high drain to high capacity) 26650 [Li ion] = 14 to 18 Wh ______________________________ Average energy of Tesla battery are around 11 Wh [18650], and to make a Tesla P100D [100 kWh] Model S, = 100 kWh / 11 Wh = 100, 000 Wh / 11 Wh = 9091 batteries or in simple words, 9091 [18650 battery] x 11 Wh = 100,000 Wh = 100 kWh. ______________________________ So i would seriously recommend 18650 enthusiasts to use Wh and kWh [our universal unit] instead of flawed mAh and Ah which are way too childish unit for energy !!
Alex McRae The phrase "would have been" is proper grammar. The phrase "would of been" is not. It is common for people to confuse "would've", which is a contraction for "would have" for "would of", which is grammatically incorrect.
Micah, nice to find someone that can speak calmly, logicaly, without screaming or music fading in and out,,, you can even smile,, very refreshing. Perhaps you would be kind enough to give me a rough idea as to how many 18650's I could get into a box with internal dimentions of 290mm x 145mm x 68mm I am only intrested in absolute max number of cells you "think" I might possibly fit in to that space. Ray
Just a suggestion to look into using 21700 cells instead of 18650 cells. You get a lot more potential for higher capacity in almost the same physical space...just an increase of 3mm Diameter and 5mm Length for *almost* 50% additional capacity. Put another way, a 21700 cell stores almost as much energy as 1.5 18650 cells of similar construction. Plus, the 18650 cells can have a lower lifetime than the same capacity 21700 cell due to increased stress on the 18650 cell when talking about very high capacity cells. Using 21700 cells may also let you go to fewer batteries in parallel for the same performance. For example, you may be able to use 3p12s instead of a 4p12s configuration. In the 12s configuration that eliminates 12 cells right there for actually a slight increase in mAh capacity. So differences in cost between similar quality 21700 and 18650 cells may become a non-issue in a given application.
DYNAMO TAPE! I remember that. Xmas gift for waking parents at 5.30am click click click!! SO glad you posted this, thanks. Got my bottle battery case,.. arrived with wires cut clean through and no BMS board courtesy of a less than honest Ebayer...but I can now still use it, I hope : )
Thank for an excellent video, this is the best battery build video I have seen yet, was building an electric bike using two bosch 36v three phase motors unfortunately it was fried when my garage went up in flames so will be starting again in a short while, regards Doc Cox
You are a very good teacher. Are you a left hander? I am and I've noticed that left-handers enjoy teaching,,, helping someone learn what was taught to us. Very satisfying. I subbed! And the spot welder was cool! I never seen that type. Didn't know it existed. I worked in a machine shop as a Sheet Metal Fabricator and we had a spot welder from the 40s. It was 6 ft tall and had a clumsy foot switch and that old green color just like the lathes. I'm 60 now and enjoy seeing new tools too. Amazing!
I'm so glad someone is actually taking the time to figure the wiring on these ebike,because being that most ebikes are made in China,a lot of them don't have wiring diagrams
Thank you so much. This is the BEST and well explained video for a person like me that has only some light knowledge of electricity. I want to build a light kit for my bike to help me commute to my work without getting there with no sweat..... THANK YOU!!! Subscribed
Another "great, informative and easy to understand Video" Thanks 😊👍🏼👌🏻 Used a few techniques I learnt from you from your Various "How To" Videos to build my own E-Bike (Mid Drive) & Battery Packs (15S /10P out of Sanyo18650GA Cells) for a Enduro E-Bike BBSHD Build
I have a new 48V 1000W rear hub on my dual suspension which has been waiting for the battery. I have around 300+ new cells @2600mah each of which I plan to build 4x29V battery packs. Connecting 2 packs in series to get my voltage (58.8V extra boost) & then the other 2. & then connect those in parallel to get 52Ah for my range. Each pack consists of 10P/7S. I'll add balance leads & cell loggers to the packs so i can physically see whats happening as i don't trust bms. The bike will also have foldable solar panels with charge controllers as i'll be doing a lot of outside stuff. & i'll be uploading videos along the way. thanks again for your tutorials! :)
To get the best results: as not all cells are created equally & there is likely always small differences in the top village they reach, you should measure a bunch and try to line them up in two rows (in this case) of seven in such a way that both the two rows will show about the same Voltage and then ONLY connect the two rows at the outer polarities (as opposed to, connecting them in pairs of two's all the way). It will minimale the indecency inbetween doubles and on, wherein unequal pairs and so on will drain percents of each other (and be probably only less than 70% efficient in that) from the highest to the lowest of each pair in order to them trying to keep evening out. Connecting two rows of seven apart from each other that way and only doubling up at front and end may save you a few percents of loss after charging.
With all that insulation & shrink wrap, is there ever a problem with heat management of the cells? Will the cells heat up with fast discharge of fast charge? And how many charge cycles might you get. Excellent video! Thanks for posting.
Nicely done. Lots of useful detail from someone who's clearly done plenty of battery building before. I've been meaning to get a battery welder for a while now. Any particular reason to pick the 787A versus other hardware?
Hi Mike, Could you do a video about the various BMS's, (smart BMS vs regular etc) and tips about what to consider when searching for one, you know, kind of guidelines for selecting the best one suited to the battery we build? תודה מראש! 😉
Hey, first off just have to say I've found your video's really informative! Love how they're organized and they've really helped clear up things. Just have a quick question for you: If you're building a 12v battery from the panasonic 18650 cells. Would you recommend using 3 cells for 11.1V? or 4 cells for 14.8V? I know the maximum capacity is 4.2v (which would give you 12.6v for 3) but I'm thinking I should use 4 because that way I wouldn't discharge the batteries as far. (keeping them "healthier") Am I right by going this route?
Devices like radios connected to the battery in most vehicles experience a range of voltages. When the battery is charging the alternator maintains the system at about 14.5 volts. With the car off, the battery voltage is 12.6 (when full) At lower voltages, the current passing thru the connecting wires increases. Most devices perform better (cooler) at the higher ranges.
I wish you could explain why you have a backwards 1/4" phono plug and a negative wire soldered to the outside of it. I'm not familiar with this connector, but to me it looks like a music plug soldered backwards. Also I've done basic soldering and when you are soldering those wires from the BMS to the nickel strips you will notice it is beading off the strip like water droplets on glass. If you tug at those connections they should come off easy, you're supposed to either use fine sandpaper to rough up the surface or flux. any time I've seen solder look like it's beading off something and it looks like it's having a hard time sticking it means poor adhesion
Hi Bruce, what you are seeing is a property of solder known as "wetting", where the solder spreads out when it reaches a certain temperature and adheres to the nickel. It might be hard to see because I sped up the video during the soldering, but rest assured all of those joints were tested and are quite strong. Regarding the RCA plug, it's only a "music plug" if you've got music going through it. Otherwise it's a generic electrical connector. These are gold plated RCA connectors that can handle up to 5A. Other RCA connectors can carry up to 15A. The outside of the barrel on the mono end is negative and the tip of the barrel is positive. This correlates with a standard in the ebike industry for using the center of RCA connectors as positive.
YOU NEVER SAY WHAT TO DO AS IN OPYTIONS IF TWO OE A FEW CELLS ARE BAD? YOUR CHANNEL IS EASILY ONE OF THEE MOST USEFUL ALL SCHOOL NO GYM CLASS THANKS LOOL
This vid i think was more on how the cells and bms are connected than technique. If you noticed those cells have marks from previous welds before he put the pack together
Ebike School has a video: DIY 52v 10.5ah lithium battery from a kit Before I noticed that one I saw this video (off to the right) from Rinoa super genius: DIY 52v (48v) 16AH Lithium ion 18650 ... It's so funny because I have a 29" bike I'm having a hard time finding ebike supplies for and just last night I noticed 29"/700c as if it's the same thing and then I saw 28"/700c. Gotta love it. Neobattery is the place to get the batteries from $5 in lots of 40 or 100, they're on eBay and probably have their own site.
TrustInJesus111 I have 18650 batteries that I took apart from old laptop batteries. I am not 100 percent sure how to make a 48 volt 10 amp hour pack. I have soldering stuff, and spot welder just don't understand the series and parallel yet and how to get 48 volts. Lol
Great vid. I used nickle rollers with thin slice of wood dowel glued in the ends. White wool for bus bars, red wool for positive, black for neg and blue for jumpers. Made it easier for me anyway because it's 3d.. 😅😅 ps. I build circuit boards from scratch (board diagram from schematic, etching, drilling, placing, soldering etc, etc..) so no stranger to electronics. I have never built a battery pack tho and It took a couple months of research before I felt comfortable even mocking one up. I learned the nature of lithium cells and how to not burn your house down.. and In the end I ended up buying one anyway because it turns out that my homeowners insurance won't cover me for fire if the "homemade" battery erupted into fire for whatever reason. I do feel tho that my battery would have been top shelf with minimal heating up. The bms I was looking at had settable parameters like shutting down charging at 80% with active balancing I would never need to charge them to thier full value. I did overkill on the parallel to series connections with each group's amp handling at 30, which is the max I would be pulling from the entire pack.
Please get yourself a good microphone and the lights that don't flicker. Turn off all the auto-settings on your camera, so the brightness doesn't go up and down, the color balance doesn't go from warm to cold (like at 1:00).
I have enjoyed your battery build videos . I hope I am lucky enough to get your battery book,if not I will have one soon , because I will build many batteries in the future. I am excited to get started.
Just a thought with connecting your wires from the BMS you solder them on. Why don't you solder the wire on to nickel strip and spot weld them on to the battery?
I was going to ask a question, but apparently you aren't answering them. You only want people to go to your website to ask. Isn't it easier for us to ask here? Anyway, since you're not answering, nvm. Btw, what strikes me is that your using an expensive thing like a spot welder, but you're not using spacers to keep the batteries better ventilated.
Very informative video! I would strongly sugest to add some more safety proticals. Like wrapping the cells in fish paper aswell as the tops. Cut the nikel so theres no sharp edges because they can poke a hole in your shrinkwrap.
This is the video I've been looking for. I'm looking to build my own e scooter. I'm thinking 60v 30a+. Expensive to buy so want to build my own battery for e scooter. Great video.
I personally prefer to use length for parallels (to maximize capacity) because my triangle bag can't store more than 3-4 battery in one dimension. I also prefer to make long modular batteries such as 12V 20aH so it's easier to replace things
hi Mike, i saw a guy using a battery as a spot welder, which is just two pieces of 2.5mm sq cable straight of the terminals and used as probes for the welder. it was nicely made, but no timeing. he just pushes up against the probes and then takes it off. the reason i talk about this is becuase i have just seen your video about thermal heat. thanks i already have the ebike book, but would love the battery pack book. thanks
Im building an electric skateboard, and for ly battery the same cells are used so this made alot clear, it will be a 10s4p battery, :) verry good vid!!
This is an awesome informative video for building a battery pack. Especially for beginners like me. Will be checking out your book sir, such great content!
I’m in the middle of building my first battery and viewed your other video about testing the nickel strip to see if it’s plated steel, after putting a piece in salt water overnight it rusted. I have pure nickel welded to the top, .2x10mm strips, do I need to rip it apart to remove the plated steel and rebuild with pure nickel or will it be fine? It’s a high amp pack that could draw 25 amps per cell. 13s6p 21700 molicell 42a ( rated 45 amps per cell) 0:11
Very educational....I have a cruiser and I enjoy it but for quite a while I've been wanting to make it an e-bike....there is a bycycle shop in town and I am curious as to what their thoughts and input would be. I watch these folks go by on motorized or e-bikes bought by kit or the whole thing.
Hi, I have an e-bike which the battery was faulty and was not charging. I have disposed of the batteries however they were completely different to 18650 cells as these ones were 7 oblong cases with + - at the top of the each case measuring a 4.2v. the casung has a key oporating mechanism and fuse. The charging terminal is also different. Your video is brilliant and I was wondering if you could make a new video showing how to connect the battry you have thought us to build to the existing battery case. I know every bike's battery case is different but I would think the principle would be the same. Look forward to hearing from you.
Dymo labeler reminds me of my grandmother's house... only the labels fell off after 30 years. lol. if you put it between the layers does the shrink rap get embossed? Thank you for a good quality video with concise detail. I like that you share your thinking process as well as the procedure. Great presentation skills too. Better than Cats!
thank you so much for this video you have properly explained series and parallel and how to read wear each wire to the bms goes i will attempt to build a secondary battery for my escooter as the main battery is not very strong mine will roughly be double the size so 48-60V
Hi, I have a question regarding the internal resistance of 18650 battery 1- What is the risk of building a recycled 18650 lithium battery without checking and measuring the internal resistance? 2- How is the battery built after measuring and knowing the internal resistance values of the 18650 batteries, especially if the internal resistance values for each battery differ from the others for 18650 for recycled lithium batteries?
Hello Amazing creativity work , for 24V 15Ah battery pack , if you made this by 2600mah cells , for series , it will be 7 cells ; but for capacity , you will need 6 cells , 7*6 = 42 pcs , you need 42 cells in a pack .
Best explanation about make custom batere, i'm newbie, my i ask? why we make custom batere? why wenot by new pack batere with same spesification at pabrican?
I do not intend on doing this but curiosity is getting the better of me. Lets say 1 cell is knackered in parallel group that is dragging down the whole set, and you did not have a spare cell to replace. Is it safe to cut that dodgy cell out and throw it and not replace? I get that you would have a slightly smaller AH battery. But would this cause issues in terms of balancing or anything else?
Hi there Thanks for your time for showing and explaining this important things of e-bicycle battery My question is what should I use to make the battery to last long distance driving..? Thanks for your time
If you mean long range then you just need more cells in parallel .This battery only has 2 cells in parallel because it is for short range. If you mean long lifetime, then try to charge the battery up to only 95% or so and not drain it all the way to empty. That can double the lifetime of the battery.
i saw your welder you just got .. i may have to make my own batteries this summer rather then getting them from china where it came from. 72 volt 48ah for my 12,000 watt ebike thanks for your videos
Only the series strips carry current. So I would place them first (and double). Then a single parallel strip on top. This last strip does not carry any current as it only balances the cells. It's also further from the battery if the BMS balancing wire is soldered on top.
Great job... im trying to build my first e bike battery13s6p , with my microwave welder mashine DIY Thanks for that video its help me make order of work... hanks
Turbo Bob I think you make the best videos for eBikes on the Tube, what I would like to do is build a 48v Samsung 18650 30Q from start to finish, using at least 52 batteries if that is possible, step by step, with a BMS. I am a little confused on how many batteries I will need, and how to select a BMS. I have automobile experience so it is not that new to me.
some BMS have only 2 wires for charge and discharge. some have 3, for 1 charge, 1 discharge and 1 common. in the electric bike you never charge and discharge at the same time. but using offgrid solar to charge (sollar pannel + dc converter cv cc) charge and discharge happen in the day using it. if you have more info about the, please show it! I wanna remove my old "car style" lead acid batteries with solar charge controller to the better way and as far as know li-ion don't need the charge controller. just the PV and the dc converter cc cv (maybe step up and down) to feed the BMS and charge it all. I guess 7s and maybe 10 or more parallel are the better choice for solar 24V lead acid replacement but I don't really know how many amps I can feed in the pack. the PV must match the max amp feed rate of the batteries. any help are really welcome
Great video.You must make a video about the motors. I would like to make a bike to go at 50km/h... most for the hills...but it is so many the motors in the market and I don't know exactly what is important when I compare two motors. First I choose the motor and upon this, I build my battery or the reverse?
Hi, as much as this spotwelder looks nice, i think i prefer a spotwelder with handheld pens. The welds might not look as nice, but i think it's easier/faster. Thumbs up on the hairdryer, i prefer that over a heatgun or cigarette-lighter. Regards
Wow! Great video; I wondered on how this was done. I am still not ready to do any of mine; I'll send them to you! But, thanks for the great information, I loved it!
Hi, rather than using 4 strips of Ni to connect in parallel and series, you could use a single piece, just a parallelogram with the right shape. Simpler, more elegant, better connections. No need to overlap Ni strips.
Really nice video! I have a MagicShine MJ868 lamp with no battery and would like to do one my self. Is this how i do it or should i use somthing else? The original battery is 4×18650 SAMSUNG Li-ion battery (7.4V 5.6AH)
Fantastic video, I've made a 13s 48volt pack without BMS and now I regret it, I can't find a 13S balance charger, I do have a imax b6 but I can only balance charge 6S. So I ended up just bulk charging and hoping my pack doesn't get too imbalanced until I install the BMS. Just a quick note on the pack you made, i'm sure it's because the pack was built on camera, but the balance line going into the BMS is not plugged in all way.
Cali_Gear Guy I noticed that too, really hope the plug was pushed in before all the foam and heat shrink went on... kinda adds suspense to the video doesn’t it, wondering if it will work :)
oh my!!!....i'm now getting into this stuff....i learn a lot from you....i always wanted to build an 18650 battery bank for different purposes.....i don't have any of those tools.....will have to buy them easy pezie lol....
hey thanks for the video. that was nice, but does everyone have a spot welder at home??? that welder is expensive too not to mention the price of each battery shrinking material and the xpensive nickel too
So let me get this straight? On MOST lithium ion scooter packs there will be the output connection usually xt60 with thicker black and red wire and then a charging connection as well correct?
Hi bro, given that these Panasonic batteries 18650PF have max discharge current of 10A. Sizing it for 20A for 2p makes perfect sense. Hence. I dont quite get it when u said @ 14:36, that 20A is twice that what you would need. TIA for clarification.
It depends on where you plan to use your battery. This battery went on a low power bike with a 10A controller. So it had a safety factor of 2 (twice as much current available as what I would draw). If you paired this battery with a 20A controller then you'd have exactly the amount of current available as what you plan to draw. I personally like to leave a safety factor.
I hope you guys enjoyed this video. If you want to learn even more, I hope you'll consider checking out my Amazon #1 Bestselling book, DIY Lithium Batteries, available in paperback and ebook formats. a.co/iDtWdPX
EbikeSchool.com can you just solder on the nickle to the batteries
If you hotglue your cells doesnt get cooled really good and instead tear apart if one battery is faulty.
Just think about that option.
You r the man......thank you so much
Thanks for your informative videos I just bought a SM8124A internal resistance meter. Many used 18650 cells read around 30 some around 100 or more and the levels seem stable. Many read a rapidly changing reading between 25 and 60 can you give us a video explaining proper expected readings.
EbikeSchool
Friendly advice: Don't do it 4-5 times in a row. Check that video with thermal camera and comparison of spot welding and soldering. Even if you spot weld it gets some heat into the battery. It is better to spot weld once and then move to the next tab and do it in circles. This will give the battery chance to cool down a little bit.
the whole point of a spotwelder is that it stops the cell from even heating up in the first place, id only do what you said if I was soldering cells together
@@themastereal8345but still need to melt nickel
And only till 60c heated cell but still I hope it's better to do like giving gap
nah, I worked in a factory spot welding on these exact cells for four years straight in college. You just work on one cell and move one, never in four years was there a problem due to what you're describing. Few small issues were when the strap touched or welded in the wrong spot...keep a bucket of sand near by and a fire suppressant.
dude. LOVE THIS! thank you so much. I want to build a custom electric scooter because everything on the market right now just isn't fast enough for what I want
Hi, good content. I used to work for a company who manufactured battery Pack a good way to make sure the solder stays on nikel plate is to scratch it (nickel plate) with a blade, it helps solder stick better.
@@user-oe8xe4og6t hi, thank you. Where do I contact you?
I use a piece of sandpaper or a dremel
I've gotten tons of questions about where I got these materials. Everything can be found here:
18650 cells: goo.gl/tVjREI
Nickel strip: goo.gl/VIrNQq
Spot welder: goo.gl/cZS1yC
BMS: goo.gl/S6gSQx
Silicone wire: goo.gl/xmpbKD
Black 18650 cell spacers: goo.gl/hQxWF6
Large heat shrink tubing: goo.gl/6v1ow9
Foam sheet for protecting battery: goo.gl/5e71tE
Hi will these batteries work, i'm not sure because they are a lot cheaper than the other ones on ebay.
www.ebay.com.au/itm/Brand-Tikon-3-7V-Rechargeable-18650-Li-ion-Lithium-Battery-Cell-Fr-Flashlight-OZ-/331328395337?var=&hash=item4d24b61849:m:mrpIJrj1oWd5miqvwQUBOXA
Hi there , Great video I'm planning on building an Ebike and I was wondering if these are a decent battery www.alibaba.com/product-detail/Hot-sale-hight-quanlity-3-7V_60169974596.html?spm=a2700.7724838.0.0.mpG9Mi
Pancake - No, I'm sorry but these aren't so good for ebike use. They cheaper chinese cells and are of questionable quality. These work fine for flashlights, but aren't appropriate for high power devices like ebikes.
Thanks for the response but were you referring to the batteries I had listed or pancakes ? or both?
Richie, sorry I thought I had tagged that. I was referring to Pancakes. Now I see yours. Those look like either knock offs of Samsung 26F cells (perfectly good but low power cells) or they are genuine but the vendor doesn't have the rights to sell them so they aren't showing the label with cell info. If they are knock offs then they are only as good as the average cheap chinese cell (not very good). If they are genuine, then they are just fine but you'll need to use enough in parallel to cover your current needs since they are low power cells rated for max 5A draw each.
Really really really great video. Calm, clear voice with no annoying pretend excitement. I might retire in S. America and, while I love my Haibike MTB, Bosch ebike systems aren't serviced there - I believe. Now I'm confident I can convert a bike to electric and service it myself. Thanks!
Power = Voltage x Current
W = 3.7V x 20A
W = 74
Energy = Voltage x Current x time
W time = V x I x time
W hour = 3.7V x [3000 mAh]
W hour = 3.7V x 3 Ah
Wh = 11.1
That simple.
And for reference,
1000 Wh = 1 kWh [1 Electrical Unit],
which is what our kWh energy meter uses in home
________________________________
mAh and Ah which are seriously flawed unit (which doesn't take voltage into account),
which is normally used by manufacturers and marketers to misguide people !!
Professional and universal unit for energy are,
kWh or Wh.
I mean, these all of us use kWh meter in home, kWh in Tesla car,
and 1000 Wh = 1 kWh.
(how else simple do you want ??)
Still people use mAh and Ah, wonder how lame can they get !!!
And for comparison (different rechargeable battery types):
AAA [NiMH] = 1 Wh
AA [NiMH] = 2.5 Wh
AA [Li ion] = 3 Wh
C [NiMH] = 5 Wh
D [NiMH] = 10 Wh
18650 [Li ion] = 8 to 13 Wh (high drain to high capacity)
26650 [Li ion] = 14 to 18 Wh
______________________________
Average energy of Tesla battery are around 11 Wh [18650],
and to make a Tesla P100D [100 kWh] Model S,
= 100 kWh / 11 Wh
= 100, 000 Wh / 11 Wh
= 9091 batteries
or in simple words,
9091 [18650 battery] x 11 Wh = 100,000 Wh = 100 kWh.
______________________________
So i would seriously recommend 18650 enthusiasts to use Wh and kWh [our universal unit] instead of flawed mAh and Ah which are way too childish unit for energy !!
Chandraprakash G f*ck Google, next time I'll ask you haha
Thanks for the tip friend. I was searching for this
You are the MAN!!!
Thanks...
💪🏻🤓🤓🤓🤓🤓🤓🤓🤓🤓👍🏻
Thanks for your teachers research papers
Amperage is a measurement of electrons flow wattage is a measurement of power one's not more professional than the are just different measurements
Be sure that you have a talent. You explain things in such a way that no questions arise. Everything is quite clear.
Learned more from this video than from 11 years of school
where did you go to school
Went to a school where I learned that question end with a question mark. You didn't learn that.
+Tom Miller I grew up in Antarctica.
I didn't learn that in the Icelands.
Hi
Alex McRae The phrase "would have been" is proper grammar. The phrase "would of been" is not. It is common for people to confuse "would've", which is a contraction for "would have" for "would of", which is grammatically incorrect.
Micah, nice to find someone that can speak calmly, logicaly, without screaming or music fading in and out,,, you can even smile,, very refreshing. Perhaps you would be kind enough to give me a rough idea as to how many 18650's I could get into a box with internal dimentions of 290mm x 145mm x 68mm I am only intrested in absolute max number of cells you "think" I might possibly fit in to that space. Ray
Just a suggestion to look into using 21700 cells instead of 18650 cells. You get a lot more potential for higher capacity in almost the same physical space...just an increase of 3mm Diameter and 5mm Length for *almost* 50% additional capacity. Put another way, a 21700 cell stores almost as much energy as 1.5 18650 cells of similar construction.
Plus, the 18650 cells can have a lower lifetime than the same capacity 21700 cell due to increased stress on the 18650 cell when talking about very high capacity cells.
Using 21700 cells may also let you go to fewer batteries in parallel for the same performance. For example, you may be able to use 3p12s instead of a 4p12s configuration. In the 12s configuration that eliminates 12 cells right there for actually a slight increase in mAh capacity. So differences in cost between similar quality 21700 and 18650 cells may become a non-issue in a given application.
Thats rite
DYNAMO TAPE! I remember that. Xmas gift for waking parents at 5.30am click click click!! SO glad you posted this, thanks. Got my bottle battery case,.. arrived with wires cut clean through and no BMS board courtesy of a less than honest Ebayer...but I can now still use it, I hope : )
Thank for an excellent video, this is the best battery build video I have seen yet, was building an electric bike using two bosch 36v three phase motors unfortunately it was fried when my garage went up in flames so will be starting again in a short while, regards Doc Cox
You are a very good teacher. Are you a left hander? I am and I've noticed that left-handers enjoy teaching,,, helping someone learn what was taught to us. Very satisfying.
I subbed! And the spot welder was cool! I never seen that type. Didn't know it existed. I worked in a machine shop as a Sheet Metal Fabricator and we had a spot welder from the 40s. It was 6 ft tall and had a clumsy foot switch and that old green color just like the lathes.
I'm 60 now and enjoy seeing new tools too. Amazing!
Congratulations!
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Wow! This is an awesome video! One day when I'm feeling really ambitious I might try this!
I'm so glad someone is actually taking the time to figure the wiring on these ebike,because being that most ebikes are made in China,a lot of them don't have wiring diagrams
my favorite new catch phrase, "let's get shrinking!" 😂 awesome video, thanks for the info
Thank you so much. This is the BEST and well explained video for a person like me that has only some light knowledge of electricity. I want to build a light kit for my bike to help me commute to my work without getting there with no sweat..... THANK YOU!!! Subscribed
Another "great, informative and easy to understand Video" Thanks 😊👍🏼👌🏻 Used a few techniques I learnt from you from your Various "How To" Videos to build my own E-Bike (Mid Drive) & Battery Packs (15S /10P out of Sanyo18650GA Cells) for a Enduro E-Bike BBSHD Build
I have a new 48V 1000W rear hub on my dual
suspension which has been waiting for the battery. I have around 300+
new cells @2600mah each of which I plan to build 4x29V battery packs.
Connecting 2 packs in series to get my voltage (58.8V extra boost) &
then the other 2. & then connect those in parallel to get 52Ah for my range.
Each pack consists of 10P/7S. I'll add balance leads & cell
loggers to the packs so i can physically see whats happening as i don't
trust bms. The bike will also have foldable solar panels with charge controllers as i'll be doing a lot of outside stuff. & i'll be uploading videos along the way. thanks again for your tutorials! :)
Great video. It was fun watching your spot welder!
this is like magic, I loved ur work, the tools the tape the souder ..basicly every thing *--*
Ever try moving the spot weld electrodes a little closer together? Looks like they are too far apart causing minor issues.
ElGattoLoco- agreed. It looks like he's got them set as close as this amazing machine can be set at. I would bend them a little closer.
Watching you heatshrink the pack is strangely satisfying.
To get the best results: as not all cells are created equally & there is likely always small differences in the top village they reach, you should measure a bunch and try to line them up in two rows (in this case) of seven in such a way that both the two rows will show about the same Voltage and then ONLY connect the two rows at the outer polarities (as opposed to, connecting them in pairs of two's all the way). It will minimale the indecency inbetween doubles and on, wherein unequal pairs and so on will drain percents of each other (and be probably only less than 70% efficient in that) from the highest to the lowest of each pair in order to them trying to keep evening out. Connecting two rows of seven apart from each other that way and only doubling up at front and end may save you a few percents of loss after charging.
your post is poorly written and therefore difficult to understand.
the best video on DIY battery. nobody explained the connection in the other side of the battery
This laptop battery is the best quality, I also made one power bank by using the laptop battery.
With all that insulation & shrink wrap, is there ever a problem with heat management of the cells? Will the cells heat up with fast discharge of fast charge? And how many charge cycles might you get. Excellent video! Thanks for posting.
Nicely done. Lots of useful detail from someone who's clearly done plenty of battery building before. I've been meaning to get a battery welder for a while now. Any particular reason to pick the 787A versus other hardware?
Best tutorial on 18650 packs so far
you should make more videos. this is incredibly helpful to people!
Thanks! I've got a few more coming, don't worry!
Please do a video on how to build a 36v 12a thx bro
I've got a video upcoming where I increase the voltage of a 24V 20AH battery to 36V 20AH by adding cells, hopefully that will be helpful for you!
Keep em coming! :)
most detailed tutorial on battery builds out there. well done.
Hi Mike,
Could you do a video about the various BMS's, (smart BMS vs regular etc) and tips about what to consider when searching for one, you know, kind of guidelines for selecting the best one suited to the battery we build?
תודה מראש! 😉
Watching this video has given me the confidence to repair my own e-bike battery when I need to. Thank you 👍👍👍👍😎😎
Hey, first off just have to say I've found your video's really informative! Love how they're organized and they've really helped clear up things. Just have a quick question for you: If you're building a 12v battery from the panasonic 18650 cells. Would you recommend using 3 cells for 11.1V? or 4 cells for 14.8V? I know the maximum capacity is 4.2v (which would give you 12.6v for 3) but I'm thinking I should use 4 because that way I wouldn't discharge the batteries as far. (keeping them "healthier") Am I right by going this route?
Devices like radios connected to the battery in most vehicles experience a range of voltages. When the battery is charging the alternator maintains the system at about 14.5 volts. With the car off, the battery voltage is 12.6 (when full)
At lower voltages, the current passing thru the connecting wires increases. Most devices perform better (cooler) at the higher ranges.
Can't believe I watch this whole thing! Awesome video
I wish you could explain why you have a backwards 1/4" phono plug and a negative wire soldered to the outside of it. I'm not familiar with this connector, but to me it looks like a music plug soldered backwards. Also I've done basic soldering and when you are soldering those wires from the BMS to the nickel strips you will notice it is beading off the strip like water droplets on glass. If you tug at those connections they should come off easy, you're supposed to either use fine sandpaper to rough up the surface or flux. any time I've seen solder look like it's beading off something and it looks like it's having a hard time sticking it means poor adhesion
Hi Bruce, what you are seeing is a property of solder known as "wetting", where the solder spreads out when it reaches a certain temperature and adheres to the nickel. It might be hard to see because I sped up the video during the soldering, but rest assured all of those joints were tested and are quite strong. Regarding the RCA plug, it's only a "music plug" if you've got music going through it. Otherwise it's a generic electrical connector. These are gold plated RCA connectors that can handle up to 5A. Other RCA connectors can carry up to 15A. The outside of the barrel on the mono end is negative and the tip of the barrel is positive. This correlates with a standard in the ebike industry for using the center of RCA connectors as positive.
EbikeSchool.com very interesting, thanks!
@@EbikeSchoolwhat is the recommended charger for this battery pack?
YOU NEVER SAY WHAT TO DO AS IN OPYTIONS IF TWO OE A FEW CELLS ARE BAD? YOUR CHANNEL IS EASILY ONE OF THEE MOST USEFUL ALL SCHOOL NO GYM CLASS THANKS LOOL
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Brilliant. Where can I lend this welding machine? In a library?
easy to find on aliexpress or ebay. also you can do it yourself, search on RUclips - battery solder from microwave oven
Thanks.
This is where I got my spot welder goo.gl/cZS1yC
EbikeSchool.com not available anylonger
AR AD I got mine at m.aliexpress.com/item/1688174875.html on sale for $180, but I haven't actually used it yet.
E-Bike GOD!!! Thank you for explaining so clearly. 100% Recommended Video
would be good to show how to make a charger for home designed battery packs
Why make you own when you can buy a good one? You only need to do it once. Cycle Satiator is good.
Hi,You weld the batteries, but is it OK to solder the nickel strips?
Dude, where did you learn to solder? Not one was up to even Ok!
I will second that comment! They are probably good enough to work, but definitely made using a flawed technique. Sorry to be negative :o)
Thank god it wasn't just me that noticed that. It's almost painful to watch
This vid i think was more on how the cells and bms are connected than technique. If you noticed those cells have marks from previous welds before he put the pack together
Yeah it was only the wire soldering portion haha
Tech Talk soldering heats up the cells significantly. Lithium cells don't like getting hot.
That's some great content and production value. That kit looks great.
Can you teach us how to make a 48 volt battery pack?
Ebike School has a video: DIY 52v 10.5ah lithium battery from a kit
Before I noticed that one I saw this video (off to the right) from Rinoa super genius: DIY 52v (48v) 16AH Lithium ion 18650 ...
It's so funny because I have a 29" bike I'm having a hard time finding ebike supplies for and just last night I noticed 29"/700c as if it's the same thing and then I saw 28"/700c. Gotta love it. Neobattery is the place to get the batteries from $5 in lots of 40 or 100, they're on eBay and probably have their own site.
TrustInJesus111 I have 18650 batteries that I took apart from old laptop batteries. I am not 100 percent sure how to make a 48 volt 10 amp hour pack. I have soldering stuff, and spot welder just don't understand the series and parallel yet and how to get 48 volts. Lol
you just add more cells dude
26:42
Can u do simple division and round up? 48/3.7
Great vid. I used nickle rollers with thin slice of wood dowel glued in the ends. White wool for bus bars, red wool for positive, black for neg and blue for jumpers. Made it easier for me anyway because it's 3d.. 😅😅 ps. I build circuit boards from scratch (board diagram from schematic, etching, drilling, placing, soldering etc, etc..) so no stranger to electronics. I have never built a battery pack tho and It took a couple months of research before I felt comfortable even mocking one up. I learned the nature of lithium cells and how to not burn your house down.. and In the end I ended up buying one anyway because it turns out that my homeowners insurance won't cover me for fire if the "homemade" battery erupted into fire for whatever reason. I do feel tho that my battery would have been top shelf with minimal heating up. The bms I was looking at had settable parameters like shutting down charging at 80% with active balancing I would never need to charge them to thier full value. I did overkill on the parallel to series connections with each group's amp handling at 30, which is the max I would be pulling from the entire pack.
Please get yourself a good microphone and the lights that don't flicker. Turn off all the auto-settings on your camera, so the brightness doesn't go up and down, the color balance doesn't go from warm to cold (like at 1:00).
Just enjoy the free content, since then humans started bitching around everything?
I have enjoyed your battery build videos . I hope I am lucky enough to get your battery book,if not I will have one soon , because I will build many batteries in the future. I am excited to get started.
macgyver would use duck tape
wrong! Just bread and water. Perhaps some milk as well
JarppaGuru an egg, 2 batteries, a wire and some ice cubes. But the problem: it would explode
JarppaGuru You forgot about the paperclip.
JarppaGur
Just a thought with connecting your wires from the BMS you solder them on. Why don't you solder the wire on to nickel strip and spot weld them on to the battery?
I was going to ask a question, but apparently you aren't answering them. You only want people to go to your website to ask. Isn't it easier for us to ask here? Anyway, since you're not answering, nvm. Btw, what strikes me is that your using an expensive thing like a spot welder, but you're not using spacers to keep the batteries better ventilated.
Hmm, good point. People don't waste your time, he doesn't care about your questions. Moving on.
he answers some questions
what's your question?
you might be able to find an online forum to answer your question
Thank You for All that you are doing for World Peace and for our Planet...
Peace.. Shalom.. Salam.. La Paz.. Namaste ..
🙏🏻 😊 🌈 ✌ ☮️ ❤️ 🕊
Congratulations!!!
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Very nice video! I'm planning to make a electric bike and I found your channel! Really good videos! And you are good on explaining! Keep making!
I like your channel. I have a lot to learn. And I start learning 😊
Just a heads up. Did you push the 8 way connector fully in? At 21:27 before you wrapped the foam it looks like the connector was not fully located?
Very informative video! I would strongly sugest to add some more safety proticals. Like wrapping the cells in fish paper aswell as the tops. Cut the nikel so theres no sharp edges because they can poke a hole in your shrinkwrap.
Great vid. Also, thanks for the DIY kindle book and the low price. I've learned so much.
You are so good at explaining , I have an ebike and the battery is not charging . what should i check before messing up the whole thing
This is the video I've been looking for. I'm looking to build my own e scooter. I'm thinking 60v 30a+. Expensive to buy so want to build my own battery for e scooter. Great video.
Very well presented, Now I can build my own. two thumbs up.
Congratulations
you have been selected among my few giveaway winners,endeavour to reach out to claim prize....🎁
I personally prefer to use length for parallels (to maximize capacity) because my triangle bag can't store more than 3-4 battery in one dimension. I also prefer to make long modular batteries such as 12V 20aH so it's easier to replace things
hi Mike,
i saw a guy using a battery as a spot welder, which is just two pieces of 2.5mm sq cable straight of the terminals and used as probes for the welder. it was nicely made, but no timeing.
he just pushes up against the probes and then takes it off.
the reason i talk about this is becuase i have just seen your video about thermal heat.
thanks
i already have the ebike book, but would love the battery pack book.
thanks
Im building an electric skateboard, and for ly battery the same cells are used so this made alot clear, it will be a 10s4p battery, :) verry good vid!!
hay. what is 10s4p battery. can you explain please. i am confused here. also working on electric longboard. thanks
10 cells in series 4 in parallel, here he does 7 cells in series and 2 in parallel
+Uneven Terrain you good
This is an awesome informative video for building a battery pack. Especially for beginners like me. Will be checking out your book sir, such great content!
I’m in the middle of building my first battery and viewed your other video about testing the nickel strip to see if it’s plated steel, after putting a piece in salt water overnight it rusted. I have pure nickel welded to the top, .2x10mm strips, do I need to rip it apart to remove the plated steel and rebuild with pure nickel or will it be fine? It’s a high amp pack that could draw 25 amps per cell. 13s6p 21700 molicell 42a ( rated 45 amps per cell) 0:11
27:00 That Dymo label maker is the way to go 💯
Very educational....I have a cruiser and I enjoy it but for quite a while I've been wanting to make it an e-bike....there is a bycycle shop in town and I am curious as to what their thoughts and input would be. I watch these folks go by on motorized or e-bikes bought by kit or the whole thing.
Hi, I have an e-bike which the battery was faulty and was not charging. I have disposed of the batteries however they were completely different to 18650 cells as these ones were 7 oblong cases with + - at the top of the each case measuring a 4.2v. the casung has a key oporating mechanism and fuse. The charging terminal is also different. Your video is brilliant and I was wondering if you could make a new video showing how to connect the battry you have thought us to build to the existing battery case. I know every bike's battery case is different but I would think the principle would be the same. Look forward to hearing from you.
Dymo labeler reminds me of my grandmother's house... only the labels fell off after 30 years. lol. if you put it between the layers does the shrink rap get embossed? Thank you for a good quality video with concise detail. I like that you share your thinking process as well as the procedure. Great presentation skills too. Better than Cats!
DFA Beagle that’s a marvellous idea for embossing shrinkwrap, I must try that sometime :) thanks!
thank you so much for this video you have properly explained series and parallel and how to read wear each wire to the bms goes i will attempt to build a secondary battery for my escooter as the main battery is not very strong mine will roughly be double the size so 48-60V
Hi,
I have a question regarding the internal resistance of 18650 battery
1- What is the risk of building a recycled 18650 lithium battery without checking and measuring the internal resistance?
2- How is the battery built after measuring and knowing the internal resistance values of the 18650 batteries, especially if the internal resistance values for each battery differ from the others for 18650 for recycled lithium batteries?
I make a 24v 15ah battery pack.The best 18650
(....) mah and how many batteries are needed? Please say if any kind of BMS will take place
Hello Amazing creativity work , for 24V 15Ah battery pack , if you made this by 2600mah cells ,
for series , it will be 7 cells ; but for capacity , you will need 6 cells , 7*6 = 42 pcs , you need 42 cells in a pack .
Please say if any kind of BMS will take place
There was a spark between the armature and the welder case at 10:00, 12:07 and 12:10 ... We used to call that method of soldering "gob soldering" ...
Nice tutorial content, although I would first solder those nickel taps and then weld them to the battery, so this way battery won't overheat.
This is the best explanation on the world
Best explanation about make custom batere, i'm newbie, my i ask? why we make custom batere? why wenot by new pack batere with same spesification at pabrican?
I do not intend on doing this but curiosity is getting the better of me.
Lets say 1 cell is knackered in parallel group that is dragging down the whole set, and you did not have a spare cell to replace. Is it safe to cut that dodgy cell out and throw it and not replace? I get that you would have a slightly smaller AH battery. But would this cause issues in terms of balancing or anything else?
Hi there
Thanks for your time for showing and explaining this important things of e-bicycle battery
My question is what should I use to make the battery to last long distance driving..?
Thanks for your time
If you mean long range then you just need more cells in parallel .This battery only has 2 cells in parallel because it is for short range. If you mean long lifetime, then try to charge the battery up to only 95% or so and not drain it all the way to empty. That can double the lifetime of the battery.
EbikeSchool.com hi
if we add more sell ,doesn't bring up the voltage?
great tutorial! Do you have a video how to make a 48v 20000mah version?
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i saw your welder you just got .. i may have to make my own batteries this summer rather then getting them from china where it came from. 72 volt 48ah for my 12,000 watt ebike thanks for your videos
Only the series strips carry current. So I would place them first (and double). Then a single parallel strip on top. This last strip does not carry any current as it only balances the cells. It's also further from the battery if the BMS balancing wire is soldered on top.
you dumbass. Never make a battery around people who don't deserve to die from your ignorance.
Great job... im trying to build my first e bike battery13s6p , with my microwave welder mashine DIY Thanks for that video its help me make order of work... hanks
Congratulations!
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So I am assuming we don't have to worry about the batteries getting hot either during charge or discharge? Great Video, thanks.
Turbo Bob I think you make the best videos for eBikes on the Tube, what I would like to do is build a 48v Samsung 18650 30Q from start to finish, using at least 52 batteries if that is possible, step by step, with a BMS. I am a little confused on how many batteries I will need, and how to select a BMS. I have automobile experience so it is not that new to me.
Fans of your channel.
Awesome work.
some BMS have only 2 wires for charge and discharge. some have 3, for 1 charge, 1 discharge and 1 common. in the electric bike you never charge and discharge at the same time. but using offgrid solar to charge (sollar pannel + dc converter cv cc) charge and discharge happen in the day using it. if you have more info about the, please show it! I wanna remove my old "car style" lead acid batteries with solar charge controller to the better way and as far as know li-ion don't need the charge controller. just the PV and the dc converter cc cv (maybe step up and down) to feed the BMS and charge it all. I guess 7s and maybe 10 or more parallel are the better choice for solar 24V lead acid replacement but I don't really know how many amps I can feed in the pack. the PV must match the max amp feed rate of the batteries. any help are really welcome
Great video.You must make a video about the motors. I would like to make a bike to go at 50km/h... most for the hills...but it is so many the motors in the market and I don't know exactly what is important when I compare two motors. First I choose the motor and upon this, I build my battery or the reverse?
Hi, as much as this spotwelder looks nice, i think i prefer a spotwelder with handheld pens. The welds might not look as nice, but i think it's easier/faster. Thumbs up on the hairdryer, i prefer that over a heatgun or cigarette-lighter. Regards
Wow! Great video; I wondered on how this was done. I am still not ready to do any of mine; I'll send them to you! But, thanks for the great information, I loved it!
Hi, rather than using 4 strips of Ni to connect in parallel and series, you could use a single piece, just a parallelogram with the right shape. Simpler, more elegant, better connections. No need to overlap Ni strips.
Shouldn't you be putting fish paper or similar insulation between the series'd packs, so the battery casing can't rub off and produce a short?
Really nice video! I have a MagicShine MJ868 lamp with no battery and
would like to do one my self. Is this how i do it or should i use
somthing else? The original battery is 4×18650 SAMSUNG Li-ion battery
(7.4V 5.6AH)
Fantastic video, I've made a 13s 48volt pack without BMS and now I regret it, I can't find a 13S balance charger, I do have a imax b6 but I can only balance charge 6S. So I ended up just bulk charging and hoping my pack doesn't get too imbalanced until I install the BMS.
Just a quick note on the pack you made, i'm sure it's because the pack was built on camera, but the balance line going into the BMS is not plugged in all way.
Cali_Gear Guy I noticed that too, really hope the plug was pushed in before all the foam and heat shrink went on... kinda adds suspense to the video doesn’t it, wondering if it will work :)
Can you solder it instead? I'm really good at soldering but I don't have a welder lol
oh my!!!....i'm now getting into this stuff....i learn a lot from you....i always wanted to build an 18650 battery bank for different purposes.....i don't have any of those tools.....will have to buy them easy pezie lol....
hey thanks for the video. that was nice, but does everyone have a spot welder at home??? that welder is expensive too not to mention the price of each battery shrinking material and the xpensive nickel too
That's why I just bought a petrol / gas motor... Was cheaper overall and just fill the tank.
Why do you have parallel battery connections? Is it to obtain the AH charge? What is the AH you are trying to achieve ?
So let me get this straight? On MOST lithium ion scooter packs there will be the output connection usually xt60 with thicker black and red wire and then a charging connection as well correct?
At 6:14 Do you risk anything or this is just for the sake of the batteries?
Hi bro, given that these Panasonic batteries 18650PF have max discharge current of 10A. Sizing it for 20A for 2p makes perfect sense. Hence. I dont quite get it when u said @ 14:36, that 20A is twice that what you would need. TIA for clarification.
It depends on where you plan to use your battery. This battery went on a low power bike with a 10A controller. So it had a safety factor of 2 (twice as much current available as what I would draw). If you paired this battery with a 20A controller then you'd have exactly the amount of current available as what you plan to draw. I personally like to leave a safety factor.