How an Upgraded Tesla Travels 400 Miles on a Charge | MIT Technology Review

Not your average used car

"Part of the Roadster’s range boost will come from using tires with less rolling resistance and from making modifications to the car’s body that improve its aerodynamics.


But the biggest improvement comes from increasing the energy density of the battery pack. Each pack contains thousands of cylindrical battery cells that look similar to AA batteries. “Cell technology has improved substantially” since Tesla designed the Roadster, the company said in its announcement. For the upgrade it will replace the original cells with new ones that store 31 percent more energy."

How an Upgraded Tesla Travels 400 Miles on a Charge | MIT Technology Review