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Milliamp Hour (mAh) An Milliamp Hour(mAh) is a unit for measuring electric power over time. mAh is commonly used to describe the total amount of energy a battery can store at one time. It's the easiest way to distinguish the strength or capacity of a battery. The higher the mAh, the longer the battery will last.
Devices that require power are rated by load, batteries are rated by capacity. The difference between load (mA) and capacity (mAh) is that capacity determines how long a battery can deliver a specific load for a specific time-In the case of mAh, it's a rating of how many mA a battery can deliver for 1 hour.Now, to calculate, you need to know the total load of all devices in your setup.he difference between load (mA) and capacity (mAh) is that capacity determines how long a battery can deliver a specific load for a specific time-In the case of mAh, it's a rating of how many mA a battery can deliver for 1 hour. Now, to calculate, you need to know the total load of all devices in your setup.