Watt-hour per kilogram

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. One watt-hour per kilogram is equal to 3,600 joules per kilogram.

Typical values

The batteries that Tesla uses in their electric cars have about 254 W⋅h/kg,[1] compared to supercapacitors that are typically between 3–10 W⋅h/kg,[2] albeit with research ongoing into enabling much higher values.

Nuclear batteries based on betavoltaics can contain up to 3300 W⋅h/kg.[3]

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References
  1. "Tesla’s batteries have reached their limit – here’s how they could go further", theconversation.com, 2017-11-16
  2. Hao Y, Santhakumar K (2013). "Achieving Both High Power and Energy Density in Electrochemical Supercapacitors with Nanoporous Graphene Materials": 3. arXiv:1311.1413. Bibcode:2013arXiv1311.1413Y. Cite journal requires |journal= (help)
  3. https://phys.org/news/2018-06-prototype-nuclear-battery-power.html
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