The capacity of a single battery can usually be directly expressed in watt-hours: watt-hours (Wh)= voltage (V)× capacity (Ah), but the battery in most products is a series of multiple batteries connected to form a battery pack.
How should the capacity of the battery pack be calculated in this case?
Series (s) Battery Pack:
The voltage is added, but the total capacity is equal to the capacity of a single battery.
Total Voltage (V) =Voltage (V) of a single battery x Number of series sections
Total Capacity (Ah)= Capacity (Ah) of a single battery
Example: Three 3.7V, 2Ah lithium batteries in series:
Total Voltage (V) =3.7×3=11.1V
Total Capacity (Ah) =2Ah
Total Energy (Wh) = 11.1 * 2 = 22.2 Wh
Series (s) Battery Pack:
The capacity is added, but the voltage is unchanged.
Total Voltage (V) =Voltage (V) of a single battery
Total Capacity (Ah)= Capacity (Ah) of a single battery x Number of parallel sections
Example: Three 3.7V, 2Ah lithium batteries in parallel:
Total Voltage (V) =3.7V
Total Capacity (Ah) =2 x 3=6Ah
Total Energy (Wh) = 3.7 * 6 = 22.2 Wh
