Turns out, the problem wasn’t with the main battery, but the smaller, low-voltage one—the kind that has been found under the hood for decades. In some new electric-car models, these 12-volt ...

Most people don’t realize an electric vehicle (EV) needs, or even has, a conventional 12-volt battery. They’re rarely talked about, but they should be! An EV’s 12-volt battery is just as ...