If I connect 8 batteries in series and two of the batteries are fully charged, while the others are partially charged, do the batteries eventually reach some sort of equilibrium?
Answer
Not generally a good idea, but it depends on the battery type.
NiCd is very tolerant of overcharging, and will equalise ok if you keep the current below C/10.
Other technologies will not work. Lithium batteries even have separate 'equalising wires" connected to each cell, so the charger can adjust the current individually.
Worse than charging an unbalanced pack is discharging it. The empty cells will be forcibly drained far past their safe minimum voltage, possibly until they are inverted. This will cause permanent damage, even if done at low current.
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