Ampere-hour

ampere-hour
Rechargeable NiMH 1.2 V batteries
Top: AA battery (2500 mA⋅h)
Bottom: AAA battery (1000 mA⋅h)
General information
Unit systemNon-SI metric unit
Unit ofElectric charge
SymbolA⋅h, A h
Conversions
1 A⋅h in ...... is equal to ...
   SI units   3600 C

An ampere-hour or amp-hour (symbol: A⋅h or A h, often simplified as Ah) is a unit of electric charge, recommended for use in batteries and electrolytic devices. It has dimensions of electric current multiplied by time and corresponds to the charge transferred by a steady current of one ampere flowing for one hour (3,600 seconds). Thus 1 A⋅h equals 3600 A⋅s or 3.6 kC (kilocoulombs).

The commonly seen milliampere-hour (symbol: mA⋅h or mA h, often simplified as mAh) is one-thousandth of an ampere-hour (3.6 C).

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