Capacity is the electricity storage capacity of a battery or accumulator. In simpler terms, it is expressed in Ampere-Hours or milliAmpere-Hours.
For example, a 1000 mAh battery is capable of delivering a current of 1A or 1000 mA for one hour, or 500 mAh for 2 hours.
The higher the mAh capacity, the longer your battery will last (and the longer it will take to fully recharge).
