# ampere-hour

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## ampere-hour

[′am‚pir ¦au̇·ər]
(electricity)
A unit for the quantity of electricity, obtained by integrating current flow in amperes over the time in hours for its flow; used as a measure of battery capacity. Abbreviated Ah; amp-hr.

## ampere-hour

A current flow for one hour measured in amperes (amps). Abbreviated "Ah" and commonly called "amp-hour," it is widely used to rate how long it takes for a battery to discharge. For smaller batteries, a milliampere-hour (mAh) rating is used. For example, a 500 mAh battery means it will release 500 milliamps of current at a specific voltage for one hour before it is discharged. See ampere.

Amp-Hours and Watt-Hours Batteries can be rated in amp-hours (Ah) or watt-hours (Wh) as shown in these examples for a digital camera. The bottom battery is equivalent to 3.3 Wh, while the top battery is equivalent to 667 mAh.
References in periodicals archive ?
This biobattery can get an energy-storage density of about 596 ampere-hours (A/h) per kg - an order of magnitude higher than the 42 A-h/kg energy density of a typical lithium-ion battery used in various gadgets.
The author appears not to know the difference between amperes (amps) and ampere-hours (amp-hrs).
Historically, soldiers in combat preferred primary cell batteries; the admittedly more cost-effective rechargeable batteries eked out only half the ampere-hours and so were used only in training.
According to the company, the SFC A50, which weighs approximately seven kilograms, is capable of providing a daily output of 100 ampere-hours and is being touted for use in recreational vehicles and mobile homes.
IEEE defines the end of useful life for a battery as the point when it can no longer supply 80% of its rated capacity in ampere-hours.
Upon installation, the device records a vehicle's ampere-hours (Ahr) used.
7 ampere-hours of capacity in a lightweight, watertight case.

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