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Gel and lithium-ion tech could enable 1000-mile EV range on one charge
(interestingengineering.com)
This is a most excellent place for technology news and articles.
Energy density is the key component. It'd mean less weight for the same range so even if you make a 200 mile range vehicle instead of a 1000 mile range vehicle, the much smaller battery and lighter weight of the vehicle would make a huge difference, plus it'd be cheaper to make in general.