**A listing of some reference points.** Batteries have worse energy density than gasoline… but it's not nothing. Here are some: | Battery | Weight | Energy Content | | ------------------------------ | ------ | -------------- | | AA | 26g | 0.0037kWh | | 5 gallons of water, 30 feet up | 18871g | 0.00047kWh | | 1 gallon of gasoline | 2722g | ~33.5kWh | Technically speaking these are all actually measures of “**specific energy**”, which is energy per **mass**. Energy density would properly be a measure of energy per **volume**. **** # More ## Source - [Energy density - Wikipedia](https://en.m.wikipedia.org/wiki/Energy_density) ## Related - [[Gravity Battery]] - [[Energy Content Reference Points]]