Pint Battery / BMS
Back in March I recieved an older OW2114xxxxxx Pint (5313 hw and 5040 fw) with a known bad battery. The board had sat for at least 2 yrs, but I was able revive the battery and balance the cells enough to get it back riding.
They would balance to 62.6v (4.18 ea) but then 2 of the cells would lose voltage pretty quickly. Clearly 2-4 bad cells (last picture).
I was able to use this as an extra/driveway board for friends...but had to constantly rebalance the cells after each session...while also closely monitering battery temp to <130F.
After the latest rebalance, the board will show 62.6v and then immediately drop to 22.5v and die when unplugged...but individual cells still show 4.17+...
Battery is obviously shot and I would like to replace the battery w an OnlyAmps or Nexus to extend the range...but am worried the BMS may be shot too.
Any thoughts on how to bench test a BMS?
They seem hard to come by and I dont really want to buy a whole new FW pack for $300...rather go aftermarket battery and use my existing BMS, if possible.
Appreciate any help/experience.