This morning I went to plug my charger into my board for a bit before the ride to work and at the point where the battery was showing that it was around 90%, the charger light turned green and the fan turned off as though the board was fully charged. This had happened to me once in the past after I had ridden over some particularly nasty bumps which had ended up causing several of the fuse wires on my cells to snap due to the fact that my battery wasn’t particularly well secured at the time. I pulled the battery out and checked over the fuses wires but there didn’t look to be any issues. Should mention that I’ve got a 10s4p LG HE4 pack with a BMS and laptop style fast charger. I tested the voltage on each 4p pack and found that they were all sitting at around 4.02 - 4.03 volts except for the 4p pack second closest to the battery’s positive terminal which was sitting at 4.19 - 4.2 volts so this is likely why the charger stopped running at this stage. Last time I tested the pack, the cells were all pretty much balanced so I’m not sure what would cause a single 4p pack to become so unbalanced.
Is this something I should be concerned about? Is there an easy way to rebalance the cells without pulling the battery apart to charge each cell separately? My understanding is that the BMS only balances the cells at the end of a charge so I’m wondering if plugging the charger back in and leaving it for a while will get the BMS to balance the cells?