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As far as I know, Maxwell makes the best supercaps, and they cost a fortune. The best one goes for $90, and it's just aluminum and carbon (and probably other things, but the materials cost is low). I think the potential applications for supercaps as they exist now are mostly untapped. There's room for innovation in that sphere, and that's what Tesla does. Bring in economies of scale, and we might see supercaps in a lot more things.
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