HELP! My Pint BMS is sick.
-
Hey all,
It’s been a wild ride getting to this point. I bought my first Onewheel, a used Pint (800 miles, Gemini 5050) about two months ago. I love the board, but the battery was pretty cooked, so I decided to VnR it.
Things went downhill from there. I ended up removing the VnR after repeated issues and found that my cells weren’t balancing properly. After a long balancing session, the BMS overcharged several cells, and eventually I lost one completely.
Fast forward: I had the dead cell professionally replaced this week (yes, I know that's not best practice, but I’ve got a Chi battery en route and just needed this to limp me through). After the first ride, I noticed the pack was still a bit out of balance, but figured it might be the new cell settling in.
Unfortunately, after a few more rides, the issues persisted. Cell 5 is getting overcharged again, and the new cell 6 is still lagging. I left it unplugged for a few days, and when I checked today, Cell 6 had dropped 0.4V, while all the others remained stable.
It’s looking like the BMS is bleeding the wrong cell... or worse.
So, does anyone here have a spare Pint BMS they’re willing to part with? At this point, I think it’s time to cut my losses and replace it.
Appreciate any help or guidance you can offer.
-
@ikaruspint Unfortunately , I have only one Pint BMS left that I use for testing, seems like Xr, Pint BMS's are getting scarcer.
If you're in N. America, try Facebook. -
@ikaruspint Here are the little mosfets that affect cell balancing.
