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John Henderson

wrote:

When all the cells are fully discharged, it becomes possible
for one or more of them to go into a reversed polarity state.

I'd say it's an inevitable consequence of the fact that
individual cells cannot be fully balanced for all charging
parameters when assembled into a battery of cells.

The only way of ensuring maximum life from such a battery (where
individual cells aren't accessible) is to do the occasional
"equalization" charge, overcharging at a trickle rate until the
weakest cell (the one which leaks the most charge) has had time
to come up to full charge.

John