Lithium ion chemistry prefers partial discharge to deep discharge, so it's best to avoid taking the battery all the way down to zero. Since lithium-ion chemistry does not have a "memory", you do not harm the battery pack with a partial discharge. If the voltage of a lithium-ion cell drops below a certain level, it's
ruined. Please before you open you uneducated mouth do a little research on a topic. Once
You become educated then you mislead people with the bullsh*t you have been dishing out .