I have a DIY 12S8P battery that I made about a year ago from salvaged Murata VTC6A 21700 cells which cost about 20% of new cells.
After 2 sessions in the weekend, my first cell string can no longer hold a charge, as shown below.
When I plug in to charge it gets really hot because all the current is going to the low cell.
My question is should I try to replace that bad set of cells, or just be happy with the use I’ve had from it, and to play it safe and discard the whole thing? I don’t imagine trying to undo the nickel strip and plug in new cells will be easy, nor safe.
I think I know my answer but keen to hear any opinions.