![2012 Chevrolet Volt crosses 400,000 miles, September 2017 [photo: owner Erick Belmore]](http://images.hgmsites.net/tmb/2012-chevrolet-volt-crosses-400000-miles-september-2017-photo-owner-erick-belmore_100621124_t.gif)
As more battery-electric cars are sold and more drivers become aware of them, the question of battery life recurs among pretty much every potential buyer. How long will the battery last? Will I have to replace it every 18 months as I do in my smartphone? Data on the liquid-cooled battery packs of older Tesla Model S and Chevrolet Volt cars offers...