Coming back of electric car

US auto giant GM company again with electric car with new concept. the chevrolet volt will draw power execlusively from a next generation battery pack recharged by a small onboard engine.
the volt is designed to run for 40 miles on pure electric power ,making it ideal for every day family use.the volt's combustion engine is designed only as a supplement to keep its batteries charged.
the volt should be ready for production around the same time the lithium ion batteries will be ,which GM expects to be in two to three years.