Lithium ion Battery theoretical capacity calculation
ELECTRON, ION AND COULOMBIC ENERGY
Other Cathode Materials

Ampere-hour (Ah)
capacity is the total charge that can be discharged from a fully charged battery under specified conditions.

People also use Wh (or kWh) capacity to represent a battery capacity. The rated Wh capacity is defined as

Rated Wh Capacity = Rated Ah Capacity × Rated Battery Voltage:

Power : energy by second ,watt
W=A×V=Current × Voltage
Energy :power multiplied by time
WH=Ah × V=Capacity × Voltage
Capacity : Current × time Ah