Definition

ampere hour (Ah or amp hour)

Part of the Smart grid glossary:

An ampere hour (abbreviated Ah, or sometimes amp hour) is the amount of energy charge in a battery that will allow one ampere of current to flow for one hour.

A milliampere hour (mAh) is 1,000th of an Ah, and is commonly used as a measure of charge in portable computer batteries. The mAh provides an indication of how long the PC will operate on its battery without having to recharge it.

This was last updated in January 2011
Posted by: Margaret Rouse

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