Shelf Life:
The shelf life of a battery is the time that a battery might be stored and not lose more than 10 % of its original capacity.
Charge and Discharge
The charge of a battery might refer to as one of two things: (1) the associative state of capacity of the battery, or (2) the fact act of applying current flow within the reverse direction to return the battery to a fully-charged state.
Discharge, simply begins, is the act of drawing current from a battery.