Okay guys, I had my enertion 10s4p Samsung 25r pack since 2016 and properly done only 200-250 cycles?
Last year one day all of sudden it dropped its voltage from 100%, 42v to 94%,41.2v after it’s being fully charged. I thought it must because cells are getting old. It still got charged to 42v though!
Yesterday I finished a 20km ride and came home with 0% (maybe still had more then 32v, from now on I’ll use voltage instead of percentage, learnt a lesson). I put it on charge and it only charged to 40.3v which is 80% from this indicator. Okay, then I turned the board on, off, on, ran the motors used up some voltage and kept messing around and eventually the charger turned red again and charged the board up to 42v then I unplugged it, it dropped to 41.2v as expected just like what it did in the whole year.
Now, I just did a run again and charged it. This time it stays at 40.2v and I can’t trick the board/bms/charger again .
Question here, i know my pack is getting old but I really didn’t do that many cycle in the past, it’s just because the time so it doesn’t hold voltage? Isn’t charge rate being set by bms or charger? I don’t really know anything about building battery pack but how come it lost 1v of capacity in a run… did I wreck it or it’s just about time…
Any help/knowledge would be appreciated. Thinking of building a 10s10p pack for my sloppy kart.