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Yeah, cell vs pack density is certainly an easy place to claim improvements without them being applicable for the end product.
Still, even if the advances are not that extreme, we're still better today than in the original Roadster with regard to EV battery weight. Plus we're talking about an even smaller and lighter base vehicle - an Elise tub is 150 lbs; a Seven chassis is around 50.
And yes, I'm aware Caterham are claiming no relation to the Seven, but they are planning on a spaceframe and it's reasonable to expect a Seven sized car.
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