What is the Amp-hour (AH)?

The Amp-hour (Ah) is used for describing how much energy that battery can store in. The volume of the constant current (in amps) multiple with time (in hours) then got Amp-hour (AH) as battery capacity. For example, if a Bestgo-Power LiFePO4 cell, marked as “10AH @ 3C discharge, 25°C”, it means in 25°C condition, if discharge this battery with current no more than 30A (10AH, 3C), this battery can offer 10AH energy, like 30A current for 1/3 hour, or 5A current for 2 hours.