 The second generation Volt has an upgraded powertrain with a 1.5-liter engine that uses regular gasoline; the 18.4 kWh battery pack has new chemistry that stores 20 % more electrical energy and uses fewer cells, 192 compared with 288 on the 2014 Volt; it uses a new power controller that is integrated with the motor housing; the electric motors weigh 100 lb (45 kg) less and use smaller amounts of rare earth metals. GM engineers explained that the second generation Volt was developed using extensive input from Volt owners.
