W·h/kg
watt-hour per kilogram
Specific latent heatexact by definition
The watt-hour per kilogram is exactly 3600 J/kg, the standard unit of battery specific energy. A lead-acid cell is about 35 W·h/kg, a lithium iron phosphate cell 90 to 160, and a high-nickel lithium-ion cell 250 to 300.
Watch out: Cell-level and pack-level figures differ by a factor of roughly 1.5 once housings, cooling and management electronics are counted. A vendor quoting 300 W·h/kg is quoting the cell.
| 1 W·h/kg | 3,600 J/kg |
Solvers that use specific latent heat