General Motors has contacted a few hundred buyers of its Chevrolet Bolt electric car to address a battery glitch that can affect propulsion, a spokesman said Friday. The defect is present in some of the first Bolts that were manufactured and means that a car may say that 80 miles of electric power remains when in fact the battery will only last for 20 miles, said GM spokesman Chris Bonelli. The Bolt's progress has been closely monitored in the car ...