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The watt-hour per kilogram (SI symbol: W⋅h/kg) is a unit of specific energy commonly used to measure the density of energy in batteries and capacitors.
 | This article needs to be updated. (October 2024) |
| watt-hour per kilogram | |
|---|---|
| Unit system | Unit accepted for use with SI |
| Unit of | Specific energy |
| Symbol | W⋅h/kg |
| Conversions | |
| 1 W⋅h/kg in ... | ... is equal to ... |
| SI units | 3600 J/kg |
In the SI system of measurement, one watt-hour per kilogram is equal to 3600 joules per kilogram.
The batteries that Tesla uses in their electric cars deliver about 254 W⋅h/kg,[1] compared to supercapacitors that are typically rated between 3 and 10 W⋅h/kg,[2] with the best commercially available supercapacitors as high as 47 W⋅h/kg.[3]
Nuclear batteries based on betavoltaics can reach up to 3300 W⋅h/kg, although over much longer time periods.[4]
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