- Y. O.
Not necessarily, I'm speculating. The cells themselves can be the problem.Is what you're saying here that a bad BMS ruined the cells permanently? Lovely haha.
When something electrical fails sometimes similar symptoms can be caused by different failure points...or one failure causes then another.
To test the bms will shed further light on understanding what happened here.
In the end with cells that low in voltage, I'm not sure I would bother with a pack a few years old as any replacement cells would need to be closely matched for any reliability and safety.