Battery Capacity: mAh rating

 an abbreviation for milliamp hours. Milliamp hours is a technical rating that defines the battery's total capacity. The higher the mAh rating, the longer your battery can last between charges.

Battery capacity quanitifes the total amount of energy stored within a battery. More capacity equals longer time between battery charges. Battery capacity is measured in amperes, which is the volume of electrons passing through the batteries electrolyte per second. A milliAmp hour (mAh) is the most commonly used notation system for consumer electronic batteries. Note that 1000 mAh is the same as 1 Ah. (Just as 1000mm equals 1 meter).