An Austin-based startup called EEStor promised "technologies for replacement of electrochemical batteries," meaning a motorist could plug in a car for five minutes and drive 805km roundtrip between Dallas and Houston without petrol.
By contrast, some plug-in hybrids on the horizon would require motorists to charge their cars in a wall outlet overnight and promise only 80,5km of petrol-free commute. And the popular hybrids on the road today still depend heavily on fossil fuels.
Sceptics, though, fear the claims stretch the bounds of existing technology to the point of alchemy.
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