Researchers estimate that once EV batteries cost $150 per kilowatt hour (kWh), they’ll be cost-competitive with gas vehicles. For context, a fully-charged Tesla Model S 90D can go about 270 miles on its 85 kWh battery, according to the company. EV batteries have dramatically dropped in price over the last five years, according to the United Nations-backed report, Global Trends in Renewable Energy Investment 2016, released March 24.