Just a question:

I know things like laptops are using multiple cells in series in their
battery packs. But after repeated use and several charge/discharge cycles,
wouldn't one of the cells start to maybe charge/discharge faster than the
others? Or have a slightly offset voltage for some reason? In this case,
applying voltage back to the battery pack (cells in series), would charge
the cells unequally, no? Or perhaps overcharge some cells while
undercharging others?

Is this a real problem? And how would one go about solving it?
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