Best posts made by ikaruspint

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.

Hi @weno66 @Lemur

Resurfacing this topic as my Pint BMS appears to have at least 1 - 2 bad Mosfets.

When I charge my board cell 6 slowly drains over subsequent days. If I don't pull the battery it will drain to 0v (ask me how I know). If I charge the pack again (in my pint), all cell voltages come up as they should but cell 5 tends to hit max volts first. When I remove from the charger cell 5 remains high, whilst 6 starts to drop.

So basically I think cell 6 is locked open and is constantly bleeding whilst cell 5 is closed and not bleeding when it should be.

I've found someone local that seems confident to resolder fresh mosfets if I supply them. Could someone confirm if these are suitable?

My soldering guru was also wondering if there is a preferred method for removing the clear coating before beginning soldering?

Many thanks in advance :-)