"Based on exterior design alone, you would expect that such a concept would involve a V6 (or bigger) engine with a huge displacement and outrageous horsepower numbers. Instead, the designers envision the R-Zero being "powered by an electric motor yet offer a supercar level of performance." To be able to generate the 800 volts of output and rocket around the test track, the R-Zero is said to deploy around 1,200 kilos (about 2,645 pounds) of "high-tech lithium-ion batteries" and a quad of engines weighing 85 kilograms (187 pounds) in total."

Original Article Via Hugg

The one comment was interesting too:
Geepie says

#1 Welldone Audi but people wait to see more approachable electric cars for you

Tesla and Tango cost 1OO thousands $ in US and God knows how much does it cost in Europe

So if R-Zero is targeted only for Audi CEO or an Arab oil Prince what’s the deal ?