How to capacity test an 18650 cell out of a laptop battery pack
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- Опубликовано: 20 июл 2024
- How to capacity test a 18650 cell out of a laptop battery pack does! After many requests, i've tried to put this little tutorial as sweet and simple as possible showing how I remove cells from the laptop battery packs to tested cells. It should be noted that I did not include Internal Resistance testing as I don't do it. My tests with my equipment result in wildly different results that can't be trusted.
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Thanks for tuning in as always!
Pete
Yeaaaaahhh... this is EXACTLY what people want to see... Peter the master of the DIY POWERWALLS going through the laptop batteries showing his techniques haha... AWESOME dude... so much POWEEEEEERRR!!!! =]
Not my idea... blame the sparkie :) Have a few more along these lines... be their own playlist. Time go give tubes what they asked for
working on a pile of zta's in front of samsung 28's and 30's. i think you have more capacity in the shot than my whole powerwall!
Hey, Electricbike, fall off bikes much? LMAO at that one, so if your riding of bikes is much to go by god help us with what type of powerwall you'd build. Love what you do as it's always 110%.
HBPowerwall where can I go to get or purchase some?
Finally somebody who knows how to make a good instructional video without wasting any view time. Good job!
Thank-You
I learned more from this video than other 10+ videos made by others I watched about these battery cells! Good work!
My job is done! THanks for tuning in
same here, subscribed
I just recently learned of the infinite possibilities of this wonderful little battery. In my voracious hunt for videos on the topic of those far more versed in it than I, I came across your channel. I now have your notifications turned on! Like everyone else already said, your technique for explaining everything is second to none. I even was previously going to do that "CID reset", thing. Until I came across your warning. Ha! I watched that video twice to make sure I understood and didn't even attempt the process after that. Thank you!! You are now my Number One Source on all things "18650"! Thanks so much!!
Glad you're back to doing a straight up vid' again! The live streams are too long and not exactly on the subject for me to watch. I love to see some quick update videos - how you're getting on, performance, future plans, problems etc. :) keep up the good work man!
Live feeds are a way of interacting.. it's boring as all get out editing for 10 hours straight lol I need some love too!
HBPowerwall totally understand, it's not a dig, just my own preference to what i like to watch sort of thing. Either way, love what you're doing, keep up the good work!
Thank you for grinding through hours of editing, and I realize it must suck. However I am extremely grateful for your willingness to share your knowledge, and for sacrificing your time to help noobs like myself try to catch up. My ADD prevents me from being able to sit, read, and... whoa, sweet! I just found a quarter in my couch cushion!
I want to thank you for this video, I have been thinking of building a powerwall for some time now and didn't know where to start. You have packed loads of info into this presentation and I now have a much better idea of how to go about my project. You have a new subscriber!
Glad I could help!
Finally someone that explains it thoroughly. Thanks, now I can continue my little projects.
Happy I helped
I like when a lot of information is transmitted in a short time! No talking, only experiences and facts!
i'm not always like this lol
Hello! Maybe you answer so fast again. :) I want to buy a 18650 charger. It should load the cell alone -> unload and measure the capacity -> load.
I waver between the VC4 and the Opus BT C3100.
Can the VC4 itself measure the capacity? Unfortunately, I could not find an answer to the question. :)
OPUS is my pick, sorry logged in from other channel name. But I love my opus units you can get a good price on ebay here - rover.ebay.com/rover/1/705-53470-19255-0/1?mpre=https%3A%2F%2Fwww.ebay.com.au%2Fsch%2Fi.html%3F_from%3DR40%26_trksid%3Dp2380057.m570.l1311.R1.TR2.TRC1.A0.H0.XOPUS%2Bbt.TRS0%26_nkw%3Dopus%2Bbt-c3100%26_sacat%3D0&campid=5338073988&toolid=20008 or on amazon here www.amazon.com/shop/hbpowerwall
Replyed from BatteryHasher account sorry
Very interesting method of testing capacity but in my experience i like to test them by putting them in the microwave. The ones with the largest explosions and most poisonous gas are the ones with the highest capacity. The extra high-quality ones have fumes that make me cry blood.
Sounds like you could make some very watchable youtube videos - have at it, I'd sub that!
i do post vids
Finally someone that explains it thoroughly.thanks u are the best
Thank bud
That REALLY helps!! Thank you. You answered all of my questions in a single 6 minute video. Thank you!!
Glad it was helpful!
Very useful video, thanks!
I also have a Opus BT-C3100 and i'm in the process of making a small battery pack for a xenon flashlight i'm making; I want to use some 2200mAh LG cells, I got a lot of them from a local shop that repairs battery packs for power tools and now, after months, it's time to select them.
Basically I have to charge them, then run the discharhge process and see how many mAh the battery can give in order to match ones that are close.
Hey Pete, I love the database. Of course I'd have made it sortable on manufacturer, colors and most importantly, capacity. But that's just how I am.
I wished I'd had this video when I first started with the hand slicing and coveting any cell over 1500mAh. Great job my friend.
+Rocket Rose it does click arrows :)
Excellent video mate, learned a few things and just in time for my DIY 3kwh solar generator!
Awesome - my work is done :)
Vey informative! Thank your for the time you spent making this for all us dummies!🙏
I'm the ultimate dummy, glad you took something away from my tinkering
love the video , explained in enough detial for anyone to understand
Thanks for the comment Ryan :)
In my experiencie, i find that the ones that are with low voltage, are actualy very nice cells. Go testing, you will get surprise how good they are!
Yes, i think that also. Most low voltage cells are because of faulty bms. A big percentage of my 2Ah cells are lower than 2v
I save my laptop batteries and I have two of them with 2.55V and some even lower. You mean they are still usable?
Well if you mix them in a pack with high voltage ones that can damage them or even be a fire hazard, right?
Thank you for your excellent condensing of the great info! Best in Class for IPM: info per minute!!
TY sir!
I have dell inspiron 15 3521 and my battery (became dead) is assembled in a same fashion as you have shown in the video. Is the batteries shown in the video are connected in parallel? I want to check their volts so my question is do I need to dismantle the cells to check volts? or how can I? Thanks.
Sorry for all the questions but I'm just starting out and have just got my first delivery of loads of laptop batteries, 1 should all battery charge to 4.2v? 2 Should groups of cell ah's be approx all the same if not what kind of difference would you allow, for instance just for the question a 10s 4p if the first 10 are all 2000mha what would happen if the next 10 are 1800mha and the next 2100mha each cell? 3 I have come across some cells that are below 1.5v but have charged up just fine will these cells be affected in any way some have been less than a volt, I know I should leave them a while but it's all exiting at the moment. I do blame you and a few others video's for the mess and batteries charging when the better half complains as your one of the reasons I got interested in the first place, but honestly, thanks love the video's for the entertainment and knowledge you've given me plus it's actually changed my lifestyle.
Hi, I have an old HP laptop battery sitting on my shelf for 3 years. I just recently tested it. 1 parallel set was dead at 0V, but the other 2 set both have 3.9-4V. Does that mean they're ok? How is it still having 4V after sitting on the shelf for 3 years? And they were used 4 years prior, so total of 7 years old.
great video mate keep up the good work
Thank-You Joshua
"I put them in packs because it's safer"
Also sets a running metal power supply on top of them.
Love your videos though! I always learn a lot. :3
Yes i spot that aswell,but is no chance they get shorted from psu anyways
Even if you want.
May be a really dumb question, but do we need to buy an IMAX and an Opus charger? Does one do a different job to the other or can they both be used for charging, then discharging and determining capacity? Would preferably like to only buy one if possible!
This video is about to help me out. Thanks man
Thanks for tuning in
Any recommendation on further readings on how this process works? I don't understand how the capacity is mapped out. And essentially what it is really -- AmpH ??
thanks for a simple straight to the point video.
Thanks for tuning in
Kinda interesting with how much passion you get to this topic. Some things you do are a bit dodgy and dangerous propably. And old batteries are still just old batteries... But this makes sense for DIY powerwalls for sure
We all do things that are dodgy, i just admit to them :) I like most learn from my mistakes and it's been kind to me so far
awesome explanation, you just saved me tons and tons of hours. That is why I suscribed to your channel, you da man....
I've wasted them so you don' t have to :)
fantastic video and still the best one out there. why dont you bother wioth cells under a certain voltage, is it a time thing?, i've had plenty of good cells come back from under 2volts and have worked fine.
What's the brand and capacity of those purple batts? I have a similarly colored ones and i cant seem to find them from your site. Thanks!
Love your channel but think those sanyo zta you scrapped may have been good as charging voltage is 4.35 and not 4.2 hence low storage
Thanks for this video, I was looking for exactly those cells because I don't have the needed testing equipment. Unfortunately it seems like they're too low for my needs, so I will just recycle them.
Thanks for tuning in
That’s an awesome little video. Thanks.
I’m a Brissy Newby and like watching your videos 👍
Awesome - welcome to the channel sorry it took a few days to reply
Is discharging at 1A recommended for all cells? If a cells only rated for 500mAh discharge is that cell just not worth using? I discharged a cell at 1A and it got hot enough to trip the Opus to stop discharge, so I removed it from the charger thinking it was bad. Later I discovered on DIY Powerwall that its only rated for 500mAh max discharge. Is it actually a "good" cell assuming overheat was due to discharging beyond its rated maximum. Thanks!
I see you do the charge test at 1000mA, I done some cells yesterday both the same brand on my Opus, One got very hot to touch and the other one was room temp. The hot one is rat s%#t?? or should I do the test at 200mA so they don't get as hot?
Best ive used for cells seems to be crack them like pecan with channel locks.
Thanks for this video, fast paced and packed with info.
I just charged, tested, and recharged 16 Panasonic NCR18650s using a Zanflare C4. They all show relatively good capacity (they were only discharged at 500mA though, so I don’t know how useful the measured capacity is). The charger said 4.2 at the end, but my meter shows 4.11-4.13 across the board. Would you consider that voltage reading at full charge to indicate a bad cell or should I just use that measured voltage as my baseline when I measure again in a month?
Nop ignore the voltages - every cheap device is calibrated with a coke can half full with water - just test every cell the same way with the same sort of equipment.
Thanks! Just tested all the cells one month later and they have only dropped .01-.02v. I’m calling that a success.
Nice one . long time we miss
Since you setup the complicated expensive BMS I always feel stranger
Yes, i should spread my video subject matter out a little more.
Hello! Great videos! I'm in the charging process and marking initial voltage.. most of them are around 4.05 to 4.18v... you only mention 4.2, do you avoid anything under 4.2??? Thanks!
I have the same question
good battery is considered, what I've seen, at 4.15-4.20 volts. I think new battery may not even have 4.2 (after charging and sitting ofc) :D
my batteries never stay at 4.2 they always between 4.14-4.18 ...so i dont know where he gets 4.2 after 1 month lol
Thank you for sharing information
My pleasure
Thanks for that... I'm already doing my cells exactly the same way as you're doing yours, so good to know I'm not doing anything wrong. Do you find that Sanyo Red cells almost always get hot during charging? I always seem to end up throwing out the Sayno red ones. Cheers!!
Jim Conner yes there is a higher amount of red Sanyo's that get discarded but you can still get plenty of good ones.
Sanyos from 2013-2016 are pure crap. They even had a recall, since they emit heat above 3.95V, and get quite hot if you charge them above 500mA.
Those are exactly the ones I'm talking about... They're very strange because if you let them cool down again once they get hot, they then charge all the way up to 4.2 without getting hot again.. and they still give good capacities. I pulled apart 7 laptop packs a few months back, and rejected the cells from six of them because of the heat... I wasn't sure if they were unsafe, or if I could use them for some low current projects so I just put them back in the battery recycling box at work (where the packs came from in the first place). Cheers!!
You will find using Sanyo's that do get a bit warm would be fine in a Powerwall application because every cell has such a little draw from it.
You also need to define what warm and hot is. Everything under say 70c you most likely won't have a drama with but over that I would discard.
In my case, the cells were sitting at around 60 C and the Opus charger had backed off the current down to around 100mA, probably due to the high temps... They were taking forever to charge, which is why I noticed how hot they'd got. Cheers!!
I used to buy bulk laptops every single battery the was under grade or obsellite I easy get $2 aud for the batterys from people doing the same type things. My question is it worth it to test and resell them?
Hello there, I have just watched your video and I don't have much knowledge about these batteries, I have got 6 of them and I would like to use them for a project, I extracted them from a laptop battery just like you did, multimeter shows they range between 1.75 to 1.90 volts , are they too low? can I charge them? or they are rubbish?
Ok pet I've started building my own...thanks though inspired like I always say... one thing if you want to check your mah instead of checking with a multi meter even on the laptop battery before breaking it theyll show you which one...I've checked I might be wrong but pls advise
if it understand what your saying corectly - Voltage has nothing to do with capicity. a 0.2v cell can be recovered to a 3000mah cell and in the same light can also be a 500mah cell.. test them all
@@HBPowerwall ok totally understood....another question is y do you have to charge and discharge your batteries before using it in a power wall because I mean we put all cells to full charge putting them upto 4.2 volts first so y discharge?
So all of the energy used to charge and capacity test the cells is wasted? Or can it do a regenerative discharge so you can use it to test your next batteries?
My lipo charger does this.
Yes hi how are you?...I went & checked a cell that I was curious about?...I entered its serial number?...& they have a cell close to mine?...but the cell that I have isn't in their database...any tips/advice?...
what is the actual volt per cell? Plus what could the batteries be used for around the home?
Yep I get all that... what I was wondering?...was that can I build my 4s 20p groups with batteries that range in the 50mah's?...like 2300-2350, then 2350-2400, then 2400- 2049, etc. b/c in another video you have them sorted by capacity...like the 1100's, 1200's, 1300's, & so on...until you have reached the 3400's group...
making a pack of this dead laptos batteries for my E-motorcycle how many cycles can I make?
Pete, have you given any thought to 'Super Capacitors' for solar storage?
Yep, don't need them lol and never used them, to be honest. I guess they would be good for smaller systems but voltage sag on my bank is half a volt or something i think.. with a 80a load
thanks for telling me about nickel strips after i cut myself on them. jokes aside where would you typically get a bunch of laptob battry packs?
Can I use yellow/red cable with any of the black?
Excellent explainer Pete, and exactly the process I use too with pre- and post charging before and after measuring - life is too short!
Just a note, cells will always fall below 4.2V after charging and even new cells will naturally self-discharge.
Perhaps you meant 4.12V as a threshold after standing idle for a few days?
That got me a bit confused as well... There is no way a cell doesn't loose at least 10mV over the course of a couple of weeks...
I charge mine to 4,21V, then let them sit for 48hrs, if they are below 4,18V by then, they get thrown out, testing is also done after that 48hr period, since testing directly after gave me higher values in some cases and lower ones in others???
Wasn't able to measure any significant self discharge on the packs build out of these cells, one of my unused 52ah (1s24p) packs for my UPS dropped from 4,15V (my max. charge voltage) to 4,13V in one month, which I would considder good...
usually, I leave it for a few weeks so if it drops under 4.1 v I recycle - perhaps I could have done that better.
Thomas Cruz, I actually set my charging process up in a way, that i tortures the batterys to some extent, that way they will get hot really quickly if something is wrong... Degradation of the cells should be really low from one "extreme" cycle, after that they'll run between 4,15V and 3,2V anyways :) Letting them sit for more than 48hrs just isn't practical for me, since i would probbably get them messed up or i'd need tons of boxes with dates on them... For now i have 3 boxes, one with freshly charged ones, one wit ones that are a day old and one that are 2 days old, where i take them from to test capacity :) If the ones to test are empty i just use that box for the freshly charged ones and put it at the beginning of the queue, that way ther's allways roughly 48hrs between charging and discharging.
that isn't a bad way to do it either i think.. I started testing at 2amps finds good from bad much faster, however, was concerned about actually hurting cells..lol go figure
Sir whats the safest voltage of 18650 battery should i use in my small setup power wall power wall?
Those ICR batteries are super useful and people will pay good money for them even though they are low capacity cells. The output from them is great! Let me know if you're selling any of those in bulk. I have 1000s of laptop batteries but most only give off 5-6amps max... (Not making a powerwall but lots of small projects)
I sold 1000s of them and keep all others for him that i find.
Can i take a pair of batteries of the same Specs forming one cell, and mix in series with other pairs of different brand and slightly different Specs?
Hey Pete, have you seen / done anything about where the Opus charger overheats and stops discharging for a bit until it cools?
I haven't had this issue yet, i run a fan pushing air kinda over the dischargers but not directly on them..
thanks, the cell database will come in handy.... but when i checked the batteries i am currently testing, they were not on the list, they are
INE 180650E10 with Orange wrap, and a White disc.
ps, i bought a Opus charger specifically because you mentioned it in another video. its sooo much faster than the IMAX B6 i was using before it, and still use.
if you could add photos & description here www.diypowerwalls.com/t-DIY-Powerwalls-Cell-Database the community can check it out for you hopefully come up with something faster than you doing it your self ?
Good news on the OPUS, really like them - they do die after being hammered every day for 12 months but you have to expect that lol
It is very interesting to checkout your new videos
Thanks for tuning in
Thank you for this video. Something strange happened when I tested a series of SANYO UR18650A batteries. A datasheet told me: capacity 2250mAh. I discharged them first and then charged them and my BT-C3100 v2.2 charged them up to 2997 - 2999mAh. Is that possible???
Check them for self-discharge. It will give a false capacity reading if they have significant self-discharge. That is caused by a partial internal short.
would a normal recharge station for rechargeable batteries charge these batteries, a couple at a time
What do you reckon your percentage of useable cells is? What do you do with the ones that don't make the cut?
40 percent is a good extimate of cells that are above my 2100mah limmit 1800-2099 get sold given to others - under 1800 get sold off or returned to recyclers
Thanks for the education!
Ooh i educated? Ment to just show my process lol
Great tips and advice, next toy for me Opus BT-C3100 tester. Cheers
Have fun!
lately i been wanting to learn how do do this and been wanting to build something. im JUST starting. helped clean a hoarders house which had 2 kobalt 80V lawn mower batteries which never saw use and degraded just sitting in that rate hole. of the 40 cells i got 20 in good "physical" condition.
before i even bother testing charger discharging ( and buying all the relevant equipment) i need to start stocking up to make it worth my time. any suggestions for where i can acquire sources? this weekend im going to ask around at local Lowes/Home depots and see if they are willing to allow me to give some of these battery packs a second life.
After capacity testing, should you leave them at the 3v? or charge them back up to nominal 3.7 for storage?
These days i put them onto a storage charger at 3.7-3.8v
Can you explain again the specs of what is considered a good cell verses a bad cell when salvaging from labtop batteries? When you charge them back up and let them sit for a few weeks should the voltage not drop past 4.2? Is 4.0 still considered a good battery?
if after a few weeks it's above 4.1 would happily use the cell. If you left it for 2 days and it dropped from 4.2 to 4.15 I wouldn't use it. You have to work out what is acceptable to you. Short time should be near no drop - weeks with no load there should be at least some drop in voltage.
Hey mate. Where in Brissie do you get these unwanted laptop battery packs from?
Thanks for sharing.
Thanks for watching!
Is 1 Amp per cell a good discharge rate for a test? Can you let us know the differences. We would get a higher mah rating with a lower discharge rate. Thx in advance
1amp is good balance - will get the cell hot if there is an issue with it, but fast enough to be efficient to test.
Hello, actually what is bad about taking low voltage cells back to live? If you slowly charge them to 4.25V and if they hold voltage? Thanks
I'm currently packing my first powerwall :)
we aren't talking low voltage we are talking no voltage - The voltage isn't an indication of if the cell is viable or not. Capacity, resistance & head are tho
When you put the Salvage cell in a project how long do you average it last.
Going 2 1/2 years so far
Not sure if I understood it correctly. So the way to capacity test is to pre-charge to a certain voltage, then discharge to its lowest voltage and while it discharges measure how many amps are utilized by the load or discharger. Is this correct? Thanks in advance mate!
Yup
Most chargers having the "test" mode will do that charge-discharge-charge cycle and report the capacity value at the end
Starting here... just ordered Xtar VC4 and just broke a laptop battery to get my feet wet with this. hoping these are good cells
Good luck with your journey - don't forget to visit www.secondlifestorage.com to join our community :)
hi there, I'm wondering where you get all the old laptop packs? trying to find a place to find lots of old cells. appreciate your help.
If your in the US you could try bit.ly/2Oe9PLW (guys are great to deal with and fast postage) or secondlifestorage.com/misc.php?action=addir&id=43 or if your in Europe secondlifestorage.com/misc.php?action=addir&id=62
holly cow I hope that wall and board are strong enough what I mountain of cells. Are they all good to to be tested?
40% good tested 60% bad tested - but looks 100% good, so we are all good lol
After we find capacity what piece of electronic will cut off the voltage at 3.7v so we can store them
I use an IMAX unit here- goo.gl/Z2XAm6 you can parallel up 20 of them at a time and discharge them at once rather than one at a time.
Hi. Im up to about 3000 cells so far for my power wall. To test cells I charge to 4.2 and again ensure they don't self discharge. Next I load with a 50w 12v halogen light bulb for around 5 secs. At 4.2v this load sucks around 2.5A. I do a quick load test and record the difference voltage. For example the best battery I have seen is the Samsung INR18650 25R which shows 100mV, ie 4.20 to 4.10 for a single cell. Most ex laptop cells are discarded for a reason, i would be happy if 2x ex laptop cells in parallel gave me 100mV. Whats your thoughts as im looking for a cut off point, ie chuck or use. Cheers, Mark ( in NZ)
HOLY SHIT I just spent an hour getting two cuts and a blister trying to use pliers. I'm getting my gloves out and twisting that shit from now on!!
At 5:25, after you tested for discharge capacity, what criteria did you use to determine that none of the batteries are worth keeping? Was it the measured capacity relative to the specified capacity on the datasheet? Is it a percentage (e.g. 80%)?
IIRC, he only uses cells that have more then 2Ah capacity for his power wall
Where did you get all those laptop batteries? I'm here in NY trying to reach out to local electronic stores and recycle facilities to see if they collect laptop batteries.
I look everywhere and anywhere - hospitals, government offices & schools have been good to me
Hey Pete. How are you getting so many cells the same color for the perimeter of your Packs? Are the cells Heat Shrink, or are you just one lucky Guy?
Great videos you do. Learned a lot from you. Thanks Pete.
Where do you get your laptop batteries from and what laptop did they come from?
I get the batteries from where ever I can, anything from hospital to recycling centers...
I've seen on the chanel diogonewild that some batteries that lose capacity overtime, can greatly improved after few charging cycle (3-5 cycle if I remember well)
As I age i'm getting slower it's how this world works - I don't think anything gets better with time does it lol a few cycles might 'wake' a cell up but it doesn't fix any issues it has.
are 0v safe/worth to recharge using the tricks around youtube?! i've got few good brand batteries, sitting 0v for long time... thanks
0v cells are 0v for a reason... they have an issue - in the recycle bin they go
Hi
I began opening notebook batteries to take his 18650 cells and start charging the good cells with a B6 Mini (A original one, with PC port) but when the charger finish the charge with '4,2v' i measure it with the charger's meter or/and a multimeter and the voltage drop to an "4.1x"
Can be this considered a good battery to folllow the next steps or it must be just charged on 4.2v to go on?
And for the "week self discharge test" how much difference is a good discharge value to pass the test??
My idea it's use to make a battery pack for a e-scooter
Thanks for your references 0_
how can I get a graph for voltage vs. capacity out of these batteries? What kind of equipment can do that?
you could use an iCharger X8 and use the Junsi Console to log data - well that's how I would do it.
Nice video, can you please tell me, what should be the minimum capacity of each cell to make battery pack, please reply, I am waiting
it depends on the cell i guess
Hi Peter! I didn't find my battery on the data base. I dk t k ow what to do. I want to know the Mah on the battery that's why..
post in the forum photos and description or on FB - facebook.com/groups/diypowerwalls/
thats for the website, saved me big time
no worries
Where u get all them battery packs dude
What is the minimum voltage to use old batteries again. Is it 2.5V or lower? Is there any precharge needed(lower current or something) if its below 2.5V in case i can use li ions below 2.5V to reach specific voltage and than continue charging battery normally? Also if they heat up do i need to get rid of them? Please help.
There is no minimum voltage - test them all - use a TP4056 to get the charger up then Opus to discharge test the batteries
@@HBPowerwall thanks very much😁
I know I’m a little late but I saw you put the one that was 1.18 volts in the zero pile but then at the end said “these were all above half a volt and came up to 4.2” what is your threshold to throw them away?
Don't make me watch another old video to see if i screwd something up lol Voltage doesn't matter so no threshold - it's the discharge capacity at 1000ma that is important.
Love your videos Pete. A question on hot cells, Everyone says if the cell gets hot, throw it away but how do you define hot :p What is your threshold? Thanks mate!
I put my hand on the cells in the charger if they feel hotter than the rest that is reason enough to recycle them.
I don't understand. You test your cells' voltages immediately after removing from their housings and cleaning them. Shouldn't you charge them first? Otherwise, how does a low voltage reading tell you it's a bad cell? Doesn't that just mean they need to be charged? Can you explain that in more detail? Thanks.
What amph per cell would be considered adequate for a 48V 20ah battery pack? If I do 13 series.
depends on your cells..
Hey, great video! I have 42 C° when discharging at 1 amp. Internal resistance 28mR. Is it normal?
Doesn't seem horrible.. how ever there is ALOT of variables
@@HBPowerwall Thanks.
Where do you get those plastic black holders that hold the battery’s?
Amazon and ebay have them - amzn.to/2HRbXnd or goo.gl/khuX6A
Question : how comes lots of people building powerwalls get rid of cells below 1500? Is it just because you want the powerwall to be relatively compact, and if you had loads of 800mah batteries it would be massive? Just thinking because you've sort of got them so why not just use them? Thanks
For me, in my head a 2500mah cell that was 2100 mah still is still well within its useable life but if you had a 2500mah cell that was 1500 it's life will be much shorter with in the powerwall. If you had space & time, you'd use all the lower cells to make more and more 'emergency' storage. anything above 1500 to 2000 mah were passed to friends to use in their walls & anything lower was returned to the recyclers (in my case that is)