A friend charged his 12s3p P42A pack overnight and apparently used a 13s charger.
He told me about the odd values this morning, and I just told him to discharge that pack ASAP. He went for a ride and now the cells are at 4V/cell again.
I’m super glad it didn’t catch fire in his apartment…
max. cell- and battery voltages are set up properly.
Now that the pack isn’t an immediate fire hazard anymore, I’d like to know why the BMS couldn’t stop the charging. The voltages were way over the 4,25V cutoff voltage and reached up to 4,57V…
Also, what do you guys think? Is this pack safe to use after this incident if everything is checked and maybe cycled a few times with precaution, or is it time to bin it?
Maybe @Battery_Mooch can chime in and maybe enlighten us what happens to the cells if they are charged that high.
(this is a brand-new pack built by me)
12s3p P42A, 20A LLT BMS set up as charge only
Cells manufactured batch: 01 December 2020