General Motors Corp has set a target for production of an all-electric car in 2010, GM's product chief and Vice Chairman Bob Lutz said on Tuesday, according to Reuters. Lutz said the major uncertainty facing the Chevrolet Volt, a concept vehicle GM unveiled in January, was whether lithium-ion batteries can be developed to power it economically and safely. The Volt is intended to draw its power exclusively from a battery pack recharged by a small onboard engine or a normal electric outlet. A running Volt prototype is expected by the end of 2007, he said, adding that GM would take the unusual step of opening much of its development process to the media. GM has said it is aiming for the Volt to be able to run for 40 miles on pure electric power, meaning many commuters would be able to get through a day without using gasoline.