
A 2026 Mercedes-Benz battery should undergo an electronic state-of-health test at least twice a year, ideally during every ASSYST PLUS Service A or Service B interval and immediately preceding the autumn season. Modern Absorbent Glass Mat (AGM) starter batteries support intense electrical demands from complex onboard microprocessors, making routine testing essential every six months to evaluate available cold cranking amps and internal resistance before seasonal temperature drops compromise performance.






