Battery life is counted in full charge cycles, and shallow top-ups use up only part of a cycle. How deeply you run the pack down matters more than how often you plug it in.
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Yes. Cycle life is roughly counted in total energy moved, so two half-depth charges cost about the same as one full one. Avoiding the very top and bottom of the range is what extends life.
No. That advice comes from older nickel chemistries. Deep discharges are one of the harder things you can do to a lithium pack, and the battery management system does not need it.
The charger stops at full, so it is not overcharging, but the pack then sits at maximum voltage for hours, which is the state that ages it fastest. Unplug it once it is done when you can.
Method last reviewed 2026-07-29. Figures are guidance, not a substitute for the ratings printed on your own equipment.