| ampere-hour | |
|---|---|
 Rechargeable batteries Top: AA battery (2500 mA⋅h) Bottom: AAA battery (1000 mA⋅h) | |
| General information | |
| Unit system | Non-SI metric unit |
| Unit of | Electric charge |
| Symbol | A⋅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, 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 3,600 coulombs.[1][2]
The commonly seen milliampere-hour (symbol: mA⋅h, mA h, often simplified as mAh) is one-thousandth of an ampere-hour (3.6 coulombs).
- ^ "electric charge (Symbol Q). IEV 113-02-10". electropedia.org. International Electrotechnical Commission (IEC). 2020. Retrieved 2020-09-20.
Note 7 to entry: The coherent SI unit of electric charge is coulomb, C. The unit ampere-hour is used for electrolytic devices, such as storage batteries: 1 A·h = 3,6 kC.
- ^ Thompson, Ambler; Taylor, Barry N. (2008). Guide for the Use of the International System of Units (SI). NIST Special Publication 811 (PDF) (2nd ed.). Gaithersburg: National Institute of Standards and Technology. p. 45.
To convert from ampere hour (A·h) ... to coulomb (C) ... Multiply by 3.6 E+03