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I don't know much about the technology of this, but I used to play with capacitors during my teenage years and if this works even half as advertised it would be truly life altering. We could have "hybrid" solutions of a capacitor combined with a battery with the capacitor acting as a buffer to improve battery life.

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Hybrid solutions are hypothetically very nice, but as I understand it in reality the large battery banks associated with a gas-tank-like range, and the relatively minor amount of power the motors can actually put out, means that short-term power density isn't actually much of a problem.

Agreed, I was thinking that hybrid solutions do seem likely.

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