I have a 12S3P pack of LG HG2’s with a battery supports BMS. Normally it charges to 50.4V full, but recently it’s been charging to ~49.6V before spiking to 50.4V and the charger thinks it is done. But when I unplug it, it goes back to 49.6V. That was last week and I’ve been able to actually get it to charge to 50.4V without dropping. However, today, it charges to 48.6V before spiking to 50.4V and cutting the charger off. I can’t seem to get it back up to 50.4V normally.
I saw a similar post for an 8S6P battery, but my situation is slightly different as sometimes it returns to charging to 50.4V. Anyone know what might be going on? Is it the BMS or a faulty charger?