Why does the auxiliary battery of the Mercedes-Benz R350 fail?

1 Answers
HeidiLee
07/30/25 4:02am
This is generally caused by insufficient charge storage in the auxiliary battery. Symptoms of battery failure: Auxiliary battery failure can be considered a common issue with Mercedes-Benz vehicles. This fault will cause the auto start-stop function to fail, and the issue will disappear after replacement. Replacing the auxiliary battery—though it's not actually a battery, but rather a capacitor or a sensor. Function of the battery: The auxiliary battery refers to the battery that powers the entertainment system, windows, and lighting system during startup. The auxiliary battery contains several large capacitors. At the moment of car startup, it discharges to power the electrical devices.
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