At less than 99% all voltages are more or less the same across cells, so balancing is only effectively possible at 98-100% .
Not that would make any dent to the life of the battery if one cell is at 45% and the other at 46%
I don't think that's true. Voltage changes most rapidly at lower states of charge and levels off towards the end. Balancing is totally up to the BMS designer, it is nothing to do with an absolute cell condition.
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