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Thanks for all info. Lesson learned, next time I will just buy new cells on alibaba, since then I will check more often cells voltage and keep them in balance. Thanks again!

So are they safe to use? They should have 280Ah, but in fact have a lot less. When i watched a lot YT videos, all guys even with grade B cells had 281/282Ah cells

There is 1mm, just to not compress them too hard. I just don't want to let them expand much.

I ordered 4x 280 Ah cells on Aliexpress. QR codes were OK, terminals bit scratched. But overall there was no cut / puncture / deep scratches on cells. They were all in ok visual shape, no bloated cell either. I assembled cells into a battery and after a few trials and errors, I think it worked...

No, no :) Your tips and motivations were really helpful. I assembled cells into battery. For now everything is okay. Charging up to 10A, discharging up to 40A without errors. Thanks all for help!

I spend whole day trying to find the cause of the problem. The problem was connection between diy bussbar and surface of cell. My bussbars are thick and almost don't bend at all. When i made them, i polished them on both sides, to make them flat and without sharp corners, but it seems they need...

About 12 hours from 1A to 0,15A

Something crazy happened during charging. I charger whole pack to 3,6V, current dropped to 0,15A. I disassembled the pack, checked the voltage, and on 2 cells, voltage was 3,595V, and on other two voltage was 3,33V. All cells were connected firmly with copper bars. I have no idea, why there was...

I already dismounted battery and decide to make it like i should before. I connected cells in parallel, set the 3.6v voltage and I'm waiting. For now they are still charging at 7A current.

I was precharging the cells before battery assembly, but after reaching 3,333v on all cells i thought they are factory balanced and i stoped. I bought a cells 6 months before from aliexpress from SOONBUY Official Store. They had quite ok reviews (beside some ppl said they got bloated cells) and...

I have other leads made for serious work. This one are just for testing, but thanks :)

Thank You, I will top balance, and reconnect, and publish results.

But the voltage on all cells is the same when not charging.

Hi, It's my first post, just build a first battery in my life. BMS did not blow up, app connection is successful, cells 3,33-3,34V. PROBLEM: when i pluged a charger to battery, cells have different voltage during charging. When I crank up the power supply, to 14v 2A, they are disconnecting due...