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Tesla Roadster upgrade: Electric car will go about 400 miles per charge

The Palo Alto, Calif., company said that a new battery, new tires, and other improvements will boost the car's range 40 to 50 percent compared to the original.

Paul Sancya/AP/File
Diarmuid O'Connell, a vice president at Tesla, speaks at the North American International Auto Show in Detroit, Jan. 14, 2014. Tesla passed on Texas as the site of its new $5 billion battery factory. But the automaker still hopes to sell its electric cars directly to Texans over the Internet, instead of through dealerships, and it is dangling the carrot of future investment projects as an incentive.

Tesla said improvements it is making to its older Roadster model will let the electric car travel about 400 miles on a single charge.

The Palo Alto, Calif., company said that a new battery, new tires, and other improvements will boost the car's range 40 to 50 percent compared to the original.

Tesla plans to demonstrate the higher range with a drive from San Francisco to Los Angeles — about a 400-mile trip — early next year.

Tesla Motors Inc. CEO Elon Musk tweeted about the upgrade Thursday and Tesla posted more details on its website Friday.

Tesla stopped making Roadsters in 2012, the year it introduced the Model S.

The company said not to expect any major upgrades in the battery or range of its Model S "in the near term." Musk said that upgrade will happen eventually.

The Model S comes with two battery options. The larger battery has a range of 265 miles, according to EPA testing.

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