Beneath the exposed frame sits an ultra-thin battery made up of over 7,000 li-ion cells. This system is the same no matter what range battery pack you choose for your Model S –160, 230 or 320 miles. Engineers haven’t decided if the lower-range packs will house fewer cells or if it will use a full complement of lower-density cells, but performance and economics will be the deciding factors. Of course, since the Model S was designed with battery swaps in mind, drivers will be able to exchange their pack for another one using a system that has yet to be determined. Set to hit the market in 2012, the new EV will be priced at $57,400.