Volvo Car has chosen US-made lithium-ion battery systems, designed and produced by Ener1, to power a pair of plug-in hybrid V70 demonstration cars.

These cars are being put through their paces across Europe, as part of the development program planned for 2012 commercial launch of a production plug-in model. The project is a joint venture between Volvo and electric utility company, Vattenfall.

Vattenfall would test different concepts for high-speed home charging, as well as charging stations in public places, where owners pay to fuel with electricity instead of liquid fossil fuels.

Charles Gassenheimer, CEO of Ener1, said: These cars and the battery systems constitute a tremendous engineering achievement and a major step forward in the commercial evolution of electric drivetrain technology.

Volvo is every bit as demanding as you would expect. They approached this program with the same relentless passion for safety, quality and reliability that made them famous. You can’t ask for a better performance measure than that, he added.

Ener1 develops and manufactures compact lithium-ion batteries to power the next generation of hybrid and electric vehicles.