Aquila
Retired Moderator
The ideal is to keep it between 40% and 80% for as much as possible and to lean towards going above 80% rather than below 40% if there is a choice. It's better to leave it on the charger bouncing near 100% than to go below 20%, but not by much. Anything below 20% should be avoided with all reasonable measures and, even though some people will still recommend "conditioning" a battery, you should not do this - ever. Conditioning is letting it go from 100% to 0% and then recharging it, sometimes multiple times. This is very close to the worst thing you can do to a battery.