CNET slide show:
CNET gets a first look at the all-electric Tesla Roadster supercar.
Slide 4 of 10
Tesla Roadster: a battery on wheels
The Tesla Roadster is essentially a battery on wheels. Much of the company's design work revolved around developing a lithium-ion battery pack to power the car. The battery cells come from a third-party provider, but Tesla has wrapped it into a battery pack that can deliver energy rapidly for the car's acceleration.