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An ampere hour or amp hour (symbol A⋅h; also denoted as Ah or A h) is a unit of electric charge, having dimensions of electric current multiplied by time, equal to the charge transferred by a steady current of one ampere flowing for one hour, or 3600 coulombs. The commonly seen milliampere hour (mA⋅h or mAh) is one-thousandth of an ampere hour (3.6 coulombs).

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