Tesla Roadster To Get Replacement Battery, 400-Mile Range: Musk

Retrofitting new powertrains to used cars isn't something that automakers have done, historically--but electric cars may change that rule.

Now, Tesla Motors CEO Elon Musk has suggested that the Silicon Valley electric-car maker will offer a replacement battery for the 2008-2012 Tesla Roadsters that were its first production cars.

Musk's announcement came in a mid-July interview with the British magazine Auto Express, in which Musk largely reiterated what is known about the company's upcoming Model III.

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At the end of the piece, though, was a kicker: Tesla plans to offer a battery upgrade that will not only give the car a fresh battery, but use newer-generation cells and other technology to provide a significant range boost.

The Roadster, sold from 2008 through 2011 in North America (and through 2012 in other markets) had an electric range rated at 245 miles by the U.S. EPA.

The new battery, Musk said, "should have a range of about 400 miles"--quite a substantial upgrade.

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Musk didn't offer prices, schedules, or any other information.

But his comment is just another indication that the advent of mass-produced electric cars is upending all sorts of assumptions about the ways the auto industry has historically worked.