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Normal
Interesting, but is normal for a lithium battery to reduce the voltage a bit after charge. You can test it with a spare cell without bms. For me going from 3.958V to 3.952V is not due to balancing but tempertarure changes and the resting of the cell, is just 6mV. Passive balacing when the battery is not full have no sense as you are not going to win anything.