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Hi,
I my estimation, any battery pack having more than one cell, really should make use of a decent BMS.
Each cell has varying capacity, and when the pack starts to get exhausted, there are high chances one or more cells can reverse by the stronger ones.
Same goes for battery packs used in electric drills and such.
The BMS would constantly monitor every cell, and shut down the device if any one cell gets close to reversing.
Obviously, in your case, topping off the pack does help, but only on the top end of the voltage spectrum.
Jim.
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