QuantumScape’s solid state lithium metal cell battery for electric vehicles.  (Gabriela Hasbun/The New York Times)

An employee in San Jose, Calif., holds QuantumScape’s solid-state lithium metal cell battery for electric vehicles. The company is working on a technology that could make car batteries cheaper, more reliable and quicker to recharge. Batteries now might be considered one of the most exciting parts of the auto industry.