Use our online Wh ⇄ Ah Converter to easily convert between watt-hours and amp-hours by applying the correct voltage factor. Lithium eBike batteries are typically labeled in Wh while most electrical specifications are defined in Ah, making this tool essential for sizing, comparing and estimating real capacity.
Watt-hours measure stored energy while amp-hours measure current capacity. Voltage connects both values through a simple formula where Wh equals Ah multiplied by voltage. Knowing this relationship allows quick conversion between different capacity units.
Manufacturers express eBike battery capacity in Wh because it captures actual energy regardless of voltage type (36V, 48V or 52V). However, BMS and cell specifications are usually given in Ah, so converting between them ensures compatibility when comparing capacity, controller requirements or safe discharge ratings.
Suppose you have a 48V lithium battery with 13Ah capacity:
Wh = 13Ah × 48V = 624Wh
If another 36V pack has 17Ah, you can convert to Wh for fair comparison.
Amp-hours alone do not indicate total energy because voltage changes the energy content dramatically. A 10Ah 36V battery holds less energy than a 10Ah 52V pack, so always include voltage when comparing battery size.