Where is the auxiliary battery located in a Mercedes-Benz?
2 Answers
The auxiliary battery in Mercedes-Benz vehicles is located on the right side of the trunk. Here's some important information about the battery: 1. The battery is a crucial component of a vehicle, responsible for powering all electronic devices and starting the engine. 2. When the engine is off, the battery supplies power to all electronic devices. After starting the engine, the alternator takes over this function. 3. The battery is a wear-and-tear component that requires replacement. Avoid sitting in the car with electronic devices on for extended periods when the engine is off. In winter, try not to park the car outside overnight. Low outdoor temperatures in winter can reduce battery lifespan. When not driving for extended periods, disconnect the negative terminal to prevent battery drain. If the battery is dead and can't start the engine, you can call a friend for a jump start. During regular maintenance, have technicians check the battery's voltage and internal resistance with professional equipment. If these values fall below standard, it indicates the battery needs replacement.
I've helped friends locate the auxiliary battery in Mercedes-Benz cars several times, and it's usually quite hidden. The most common location is under the trunk floor on the right side—just lift the trunk mat to feel the cover, pry it open, and you'll find the battery. Why this design? Primarily to power the start-stop system, preventing the main battery from draining and affecting the engine. For example, this arrangement is typical in some GLC or C-Class models. When inspecting, note the battery is small, about palm-sized, often an AGM type, and regular replacement can prevent unexpected failures. If it's not obvious, also check the trunk sidewalls or under the seats, as Mercedes models vary slightly in placement. If the start-stop feels sluggish while driving, it might need replacing—DIY isn't hard, but always disconnect power for safety first.