Also one of Jacks complaints (and he is definitely a battery guru) is the unsophisticated interface between bms and charger. He goes into charging and monitoring voltages in some detail in that video. Because of things like internal resistance (which is wildly variabe), it is challenging to determine the state of charge under load, and some over or under voltage is normal if you deviate from the manufacturers charge profile.
ANYONE WHO IS CHARGING A BATTERY MANUALLY OR CONTROLLING A CHARGER SHOULD WATCH IT.