Originally Posted by wjs
Why would this be? Cells that are stored balanced with have less work for charger to balance.
Only if the cells in the pack have the exact same capacity, which is increasingly rare these days. If one cell has lower capacity than the rest and the pack is balanced during a discharged state, this one cell will then need to be balanced when the pack is charged or it will be at risk of overcharging. If balancing during the discharged state is avoided altogether, no balancing will be needed when the pack is charged.
It's for this reason that many of the higher quality chargers with carefully considered charge algorithms do not engage balance circuitry until the charger transitions to CV stage.