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The metaphor barely works either way and breaks down entirely once you factor in home solar.

Home solar would be a nodding donkey on the patio.

There isn't a metaphor in my post. Does the electricity burn? Or the battery?

Ok comparison then.

Something burns releasing energy. An empty battery will release less energy than a full one, just like a burning fuel tank.

fair enough, but an empty battery has more potential energy than an empty gas tank

I think the point the parent comment is trying to make is that a Ford tank cannot burn, but a battery can.