On Friday, May 8, 2020 at 4:55:35 PM UTC-4, wrote:
There was a thread about this, K2's mentioned, a rew years ago that Steve Keorner replied too. He asked the K2 engineers about reduced capacity he was getting, IIRC, their answer was to leave them on the charger for weeks at a time so they can balancecout the cells with the BMS on board.

CH

Question: I don't know about K2 batteries and chargers specifically, but generally I thought the BMS in LiFePO4 batteries disconnects completely from the charger once some maximum battery voltage is reached. How, then, does leaving them wired together for "weeks" going to do anything?

Perhaps over time the battery voltage drops back somewhat and the BMS re-engages with the charger?