The 12-volt batteries on some new electric car models are draining or dying unexpectedly, resulting in regulatory investigations and an uptick in owner complaints.

Hyundai, Rivian, and Cadillac are among the car brands affected by the battery deficiency that has bested some EVs in recent years, including brand new ones. However, the problem isn’t the main battery that powers the vehicle; the glitch lies with the smaller 12-volt battery that fuels the interior lighting and other electronic features that are supposed to last between three to six years, according to the Wall Street Journal.