Milliamp-hours, abbreviated mAh or mA·h, are a measure of electric charge. They are most often used to measure the electrical charge of a battery.

Watt-hours, expressed as Wh or W·h, are a measure of electrical energy. Wh are usually used to measure the energy consumption of a circuit or appliance.

The conversion from electric charge to energy requires the voltage and can be done using the formula below.

E_(Wh) = Q_(mAh) × V_(V) / 1000