According to a tweet from Tesla CEO Elon Musk, the company is due to announce details Friday on how the Roadsters will be able to go almost 400 miles between charges. The current Roadsters can go about 245 miles between charges, according to Tesla. Tesla stopped production of the Roadster in January 2012, as it started to ramp up production of its very successful Model S. It sold only 2,150 of the two-seat Roadsters through the end of 2011, according to a company filing.