My onewheel plus started showing 4.2 at full charge instead of 3.6 for the lifepo on only one cell. This gave me some reassurance that the BMS is just false reporting after a certain voltage because i notice it does fine all the way till around 3.6 than cell group 1 just skyrockets to the high 4s which would most likely have exploded the battery several times over if it were true as ive only just noticed and have been charging it to 58.4v for years. Im not as skilled as you so im just gonna leave it as is, overcharge warning has only shut the board off on me one time and never while riding, only when i came to a full stop after running downhill. Thanks for the write up!

@lia Not OW but I've had batteries register as fully charged on the work gear, and then they run out quickly. Put them in the charger which says half full. An hour later the lights red and the battery is hot AF. Always the old batteries.
Edited. I was at the pub.