Electric vehicles (EVs) are becoming increasingly popular due to their environmental friendliness and potential cost savings. However, EVs rely on two batteries: a high-voltage battery for powering the electric motor and a 12-volt battery for powering accessories such as lights, audio systems, and door locks. While the high-voltage battery is often the focus of attention, it's the 12-volt battery that can be the culprit when an EV suddenly becomes inoperable.