A dead 12-volt battery can be caused by lack of use. An EV’s low-voltage system is always ON, powering various computers and controlling modules, even when the vehicle is OFF. A courtesy light ...

An issue with the 12-volt battery charging system can cause certain Hyundai, Kia and Genesis EVs to suddenly lose power.

12-Volt Batteries On Electric Cars: Everything You Need To Know You may have asked yourself a very valid question about the need for a 12-volt battery in an EV built around a large battery pack.