- May 21, 2018-

Some people say that you shouldn't allow a Li-Ion battery to become fully exhausted before recharging, other people say it doesn't matter.

Truth is, with Li-Ion batteries it doesn't really matter because their discharge is closely regulated by on-board circuits.

This used to matter with the old NiCd battery chemistry because they could discharge completely and become impossible to recharge (those batteries also didn't like being charged too often, and were much more sensitive to temperature), and it matters with lead-acid batteries which also don't take too well to being discharged too much unless they are rated for "deep cycle."