Analysis of information sources in references of the Wikipedia article "Ampere-hour" in English language version.
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.
To convert from ampere hour (A·h) ... to coulomb (C) ... Multiply by 3.6 E+03