# 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 ?
Size/Group Amp-Hour Dimensions M17 17 7" L, 3" W, 6.5" H * U-1 31-32 7.75" L, 5" W, 6" H * GP40 40 7.5" L, 6.5" W, 6.75" H * NF 22 50-55 9" L, 5.5" W, 8.5" H * M34 60 10" L, 6.25" W, 7" H * GP 24 70-80 10.25" L, 6.5" W, 8" H * GP 27 95-100 12.5" L, 6.5" W, 9" H *
Amp-hours is the measurement of the total amount of energy a battery can deliver over 20 hours, at a constant rate of discharge, before dropping to 10.5 V.
This doubles your run-time and makes the amp-hour rating and longevity less important.
A fact: Batteries are rated in amp-hours, a quantity of "juice."
In this arrangement, the total capacity in amp-hours is that of the weakest battery, so if you have a 100 amp-hr 6 volt battery and an 200 amp-hr 6 volt battery connected in series, you will have a 12 volt, 100 amp-hr battery.
SPY maintenance free batteries are rated for eight amp-hours. Circle no.
At this time, the NiCad (Nickel Cadmium) batteries that came with cordless tools were rated at 0.8 to 1.0 amp-hours, which means they delivered 0.8 to 1.0 amps for one hour.
The automaker launched a larger battery pack last year, increasing from 60 amp-hours to 94 amp-hours and improving electric range from 81 miles to 114 miles.

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