Coinspeaker TSLA Stock Hit $900 in Pre-market, Million-Mile Batteries from China Expected to Power Tesla CarsMillion-mile batteries would help Tesla reach the goal it set five years ago. They would also take Tesla battery cost down below $100 per kilowatt-hour. Meanwhile, TSLA stock is up today.TSLA Stock Hit $900 in Pre-market, Million-Mile Batteries from China Expected to Power Tesla Cars