Audi e-tron II

Audi showed off this e-tron concept at the 2010 Detroit auto show, following a previous version of the concept in 2009. An electric sports car, the e-tron II uses two electric motors and a lithium ion battery pack, propelling the car to 60 mph in 5.1 seconds. Its 45-kilowatt-hour battery pack, weighing in at 880 pounds, gives the car a range of 145 miles.

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