![]() Which it will require, after sitting for a month – unless it was hooked up to a charger, using energy that way. But it is necessary to power the heater that maintains the temperature of the battery, which must be kept above a certain threshold in order to avoid damaging it and to maintain its capacity to receive a charge. The tank requires no energy to preserve the energy it contains.Įlectric car batteries, on the other hand, consume energy even when their energy isn’t being used. ![]() They do not evaporate or become less energy-dense. So long as the tank isn’t leaking, there won’t be less energy available when the piston-engined car’s owner wishes to drive somewhere – even if he left the car sitting for a month after having pumped in those 10 gallons. ![]() There is also no “energy penalty” for storing liquid energy.
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