4 ms·

Are these figures right ? Gasoline lists on wikipedia [1] as 46.4 MJ/kg which Google gets as 77g/kWh. [1] https://en.wikipedia.org/wiki/Energy_density https://

• Cerium 10y ago
  Those figures are right, the best batteries today are still like one percent as good as gasoline at storing energy. Although, you can only get about 20 percent of the energy out of gas while you can get about 90 percent out of a battery.
  • Cshelton 10y ago
    Right, and ultimately, hydrogen is one of the most (if not THE most) efficient energy storage methods. However, as far a physical storage, actually putting it in a tank, it is not as efficient. Plus, burning it is not as efficient as electricity either. Electricity and batteries are the way to go. They are around 90% efficient today and will only get better with better cooling methods and recapturing heat loss/preventing heat.