This was an insanely difficult video to make but I learned a ton and if you watch till the end you will know everything there is to know about balancing. I also point out some general tips when buying cells. Enjoy! My Cell Distributor Recommendation. Lily Zhang (Docan Power) Email: sales3@docanbattery.com Whatspp/Wechat: 0086 18269259127 Facebook: facebook.com/Lilyzhang456 Twitter: @Lilyzhang797 UPDATE 04-24-2023: Using the BMS, I charged up both packs then drew them both down to 95% then charged them back up again to ensure they would top off then drew them both back down to 95% again. I then put the BMS on the matched set and topped off again from 95% with no problems. Then I swapped the BMS to the mismatched pack and did the same thing, and it worked fine. So, the BMS probably just uses the balancer only to keep things in check once initially balanced. There does not seem to be any sort of memory in the BMS to remember the cell state once married to a particular set of cells. Nate.

Very good tutorial for balancing the battery cells before building the battery pack. Well done, great video.

That looked like it was a lot of work, so thank you for putting in the time to test this and show your results. The internal resistance is more important than the actual capacity. The BMS has no idea how much energy a given cell can store, it is only working with the amount of resistance the current it is feeding the cell encounters throughout the charge cycle. Charging LFP cells above 3.5 volts doesn't really make much sense, if you want the most life out of them. Between 3.5 and 3.65 volts you only see a small 1 or 2 percent increase in actual capacity...not enough to justify the potential damage done by charging the cells to that higher voltage.

you should do a test by top balancing your "mismatched" pack and then specifically turning off the bms cell balancing function. Then do a full discharge cycle and charge cycle and see how the cells individual voltages change during the discharge and charge. Its a fun test and you will learn alot.

Great test and explanation. Looking forward to next video. Thanks for sharing!

Thankyou 4 this.. more please

What I can draw from this video is only charge to 3.4 to avoid such conflict and take a full charge once a month or even longer.