Even when left unused, electric vehicle batteries gradually lose charge due to natural chemical processes within the cells. This phenomenon, known as self-discharge, occurs as the battery’s internal components slowly consume stored energy. Manufacturers design EVs to minimize this effect, but factors like temperature extremes and battery age can accelerate the rate of charge loss. Understanding these dynamics helps drivers optimize charging habits and extend battery longevity.


Why Your EV Battery Still Loses Charge While It's Parked  Engadget