Nice Video. One thing that I feel should be noted is when explaining wiring balance leads is that you should start with the negative and each subsequent lead is “positive” despite the wire color. In manufacturing its documented negative to positive so the only change in schematic for instance between a 3s and 4s is adding 1 balance lead and a cell. If documented positive to negative every single cell and lead label would have to be changed. This also comes into play when dealing with dual voltage packs, BMS’s, load balancers etc. The one thing that stays constant between any battery packs/ chargers is the negative lead despite the pack type. The nominal positive terminal always changes based on how many cells are in series. Im NOT saying the way you explained balance leads in video was incorrect. Just that if you look at it backwards, scaling your packs up or down become much more trivial. 11:29 You said cell 1. technically that is cell 3. cell 1 always starts from the negative side. you can plug your pack into any tester or charger to verify this.
Thanks. After watching this video I realized that I can do the same instead of buying lipo packs. Could you also attach a connection scheme? I didn't understand how you connected the balance connector.
@@DjemOk The cells are 2500mah and 25a. So that means they are 10c cells. This doesn't change due to series/parallel connections, they're still 10c. Three cells in series are still 25a. Putting two in parallel yields 50a but 5000mah. So still 10c.
What does it mean that the cell specs say that it has 10A continuous discharge ? Does it mean that I can pull a whole 10A of that cell or what exactly ?
@RCVideoReviews Yes I know it's the current rating for let say 2800mAh cell with 10A discharge rate. Now if I want to get the max current. What current I can get without getting the cell to get excessive hot ?
Usually discharge rates are specified in C as in 40c. You multiple that number times the AH rating of the pack to find the constant discharge rate in amps.
Get yourself some 10a 18650's and put them in parallel in any voltage/capacity combo you can support within the weight constraints of your quad. Putting them in parallel gives you more amperage carrying capacity. i.e. 2 10a cells in parallel let you run 20a of current.
2:04...I would add 10-20% extra on the circumference to make it easier to insert the batteries into the Heat Shrink... You know that it will shrink... ;-)
I have the same question, I just don't understand how that adds up. Each cylindrical battery is advertised @ 2500 mAh. You have 3 in series and another 3 in parallel correct? Even so 3 batteries x 2500 mAh is where the confusion for me is at. I hope that made sense. If be interested in making some flight packs
It doesn't matter how many are connected in series it will still have the same mah. It's when you connect them in parallel that the amount changes so if you have 2 in parallel then the amount would double or 3 in parallel then it would triple.
I had to do a double take on those parallel connections because it's a bit counter intuitive, but I've got it now. Good how to, thanks.
Glad it helped!
Thanks for the video dude. Easy to follow and straight forward.
Thanks John
Your description of the work done in the Video is simple yet Superb . Keep going John and we njoy flying happily .
Regards
Thanks, will do!
How do you combat the issue of esc low voltage cutoff? Considering these can be discharged further than a typical Lipo.
Add a lipo alarm to the balance plug or just put a cell checker on it and watch it as you use it.
Nice Video.
One thing that I feel should be noted is when explaining wiring balance leads is that you should start with the negative and each subsequent lead is “positive” despite the wire color. In manufacturing its documented negative to positive so the only change in schematic for instance between a 3s and 4s is adding 1 balance lead and a cell. If documented positive to negative every single cell and lead label would have to be changed. This also comes into play when dealing with dual voltage packs, BMS’s, load balancers etc. The one thing that stays constant between any battery packs/ chargers is the negative lead despite the pack type. The nominal positive terminal always changes based on how many cells are in series.
Im NOT saying the way you explained balance leads in video was incorrect. Just that if you look at it backwards, scaling your packs up or down become much more trivial.
11:29 You said cell 1. technically that is cell 3.
cell 1 always starts from the negative side. you can plug your pack into any tester or charger to verify this.
Thanks. After watching this video I realized that I can do the same instead of buying lipo packs. Could you also attach a connection scheme? I didn't understand how you connected the balance connector.
I can do better than a diagram, I can give you a dynamic diagram:
Check this out: www.offshoreelectrics.com/lipo.php
@@RCVideoReviews Thanks for the link. This is what I wanted.
BTW, How to calculate discharge rate for this battery pack?
@@DjemOk The cells are 2500mah and 25a. So that means they are 10c cells. This doesn't change due to series/parallel connections, they're still 10c. Three cells in series are still 25a. Putting two in parallel yields 50a but 5000mah. So still 10c.
Thank you. That was a very timely and useful video as that is one of my winter projects to make up some li-on packs.
Awesome. Go to it. It's kind of fun making custom packs.
What does it mean that the cell specs say that it has 10A continuous discharge ? Does it mean that I can pull a whole 10A of that cell or what exactly ?
10a is a rate not a capacity. It means you ca consume the capacity of the cell safely at a 10a rate.
@RCVideoReviews Yes I know it's the current rating for let say 2800mAh cell with 10A discharge rate. Now if I want to get the max current. What current I can get without getting the cell to get excessive hot ?
Usually discharge rates are specified in C as in 40c. You multiple that number times the AH rating of the pack to find the constant discharge rate in amps.
Great Video John plain and simple love that color "Gotta have a strategy right " lol
Thanks Robert. Yeah, I like that bright green too. It should stand out if it's ever separated from the plane.
I went to see a battery that says 10c, if I bring it to then 6 cubes, it will be 60c, do I get it right?
My quad draws less than 20 amp which cells do u recommend me to get more flight time
Get yourself some 10a 18650's and put them in parallel in any voltage/capacity combo you can support within the weight constraints of your quad. Putting them in parallel gives you more amperage carrying capacity. i.e. 2 10a cells in parallel let you run 20a of current.
thanks for that awesome video gonna give it a try!
Have fun!
How much does it weight?
What's the c rating of these batteries?
Are using used batteries or New?
What's the of this pack ?
On which plane did you used this pack any video?
Hi there good video 👍I have a question what type of lipo battery u used with ur spot welder and what’s the discharge rate in the same lipo battery ?
3s2200 40-70c. Just keep the voltage above 12v and a strong 3s lipo will probably do the job.
@@RCVideoReviews thanks man
Simple and good job!
Thank you. :)
Nice video thank you
Thank you too
2:04...I would add 10-20% extra on the circumference to make it easier to insert the batteries into the Heat Shrink... You know that it will shrink... ;-)
I rounded up to the next closest size.
@@RCVideoReviews Just as good. I mentioned it for people that never used heat Shrink.
great video! could you share links to the 3D files please? Many thanks
Here you go: www.thingiverse.com/thing:4706232
That was a great job, now I need to do is get the material to build my own I’m gonna do it step-by-step same way you did it. ⭐️⭐️⭐️⭐️⭐️
It's kind of satisfying being able to make your own packs. Thanks for the comment.
Great video thank u . Now I can make my own battery packs 😌 🤗
Go for it! It's really easy once you figure out the parallel/series arrangement.
I will try this, I got maxAmps battery, they have 30amp of discharge
Do you mean 30c or 30amps? It needs ~120a to weld.
@@RCVideoReviews check this out its 30AMPs, I have 4 of these www.maxamps.com/maxamps-18650-battery-2150mah-30a
cool
If each cell is 2500 milliamp what is the math that you use to get to 5000 milliamp total
3s = 2500mah. 2p = 2500x2.
I have the same question, I just don't understand how that adds up. Each cylindrical battery is advertised @ 2500 mAh. You have 3 in series and another 3 in parallel correct? Even so 3 batteries x 2500 mAh is where the confusion for me is at. I hope that made sense. If be interested in making some flight packs
It doesn't matter how many are connected in series it will still have the same mah. It's when you connect them in parallel that the amount changes so if you have 2 in parallel then the amount would double or 3 in parallel then it would triple.