General Motors' CEO says a small battery company backed by the automaker is working on breakthrough technology that could power an electric car 100 or even 200 miles on a single charge.

CEO Dan Akerson says the car could be on the market in the next two to four years. He says the company knows the battery will go for 100 miles. He says the range could double with some luck. Akerson says an electric car with a 200-mile range would be a game changer.

GM sank $7 million into the company called Envia Systems in January of 2011. Envia is based in Newark, Calif.