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Discussion Starter · #1 ·
I've got 44 CALB 180Ah cells from about 2018. Three of these cells do not want to take a full charge - that is - I can get them to about 3.4 volts but then they will suddenly show 3.8 - 4.0 volts while all the other cells show a consistent voltage of 3.4 volts. I'd like to be able to charge my whole pack so each cell reaches 3.65 volts but with these three cells acting so strange I can't do that.

Any ideas?
 

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Discussion Starter · #3 ·
All in one string, no paralleling?

Have you balanced them, or verified they are balanced against each other? At what SoC point?

Have you cap tested each?
I pull out the 3 turd batteries (and one good one) and connect them in series and use a 12V charger to charge them and an inverter to discharge. When I wire them in parallel I can balance them at 3.2 volts, and 3.3 volts with a power supply.

I've not done a proper capacity test on these since I can't seem to charge fully?
 
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