Can the auxiliary battery of a Mercedes-Benz be recharged?
2 Answers
The auxiliary battery of a Mercedes-Benz can be recharged, but there is no need to deliberately charge it as long as the vehicle can start. The auxiliary battery is specifically responsible for the engine start-stop function and is unrelated to the main battery, so it does not affect normal driving. However, it may sometimes cause the dashboard not to display the instrument status, and the automatic start-stop function may not work. Introduction to the auxiliary battery: The "auxiliary battery" is not actually a battery but a capacitor or a sensor. Auxiliary battery failure: Repairs should be based on the meaning of the fault code. Possible issues include low battery voltage, battery damage, or faults in the wiring or control circuits.
The auxiliary battery of a Mercedes-Benz can certainly be charged, especially AGM batteries used in start-stop systems. I often maintain the one in my car with a charger. Last time when the battery was low and had trouble starting, I connected it to a smart charger for a few hours, and it worked quite well. When charging, make sure the vehicle is turned off and the battery terminals are clean to prevent short circuits. The lifespan of an auxiliary battery is usually 3-5 years. Charging can restore most functions after excessive discharge, but if the battery is too old with internal damage (e.g., voltage below 12 volts), charging may not work, and it’s time for a replacement. After driving, try to turn off extra electronic devices to reduce discharge and avoid premature battery failure. Developing a habit of regular battery checks can extend its lifespan and prevent breakdowns on the road.
