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Replacing the Auxiliary Battery on Mercedes E-Class

Model: Mercedes Classe E W212 - Years 2009-2016
Part: Battery

Do you want to replace the secondary battery on a Mercedes E-Class? Remove the battery from the trunk or from the vehicle's floor. Open the car door or hatch and locate the small auxiliary battery stored inside the plastic container. Once you remove the cover from the dedicated compartment, you will find the auxiliary battery with the electrical terminals. Unscrew the fastening pins of the battery terminals, then remove the battery from the compartment and replace it with a new one (same voltage). Connect the electrical terminals to the new battery and test its operation.

Updated on 15 April 2026 by ScegliAuto

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On the Peugeot 407, the boot may become stuck, possibly due to a problem with the control button or the lock actuator. In such cases, you can perform an emergency opening by following the simple procedure shown in this tutorial. First, open the rear doors, then lower the seat back by operating the release lever. Next, go inside the boot, locate the lock, and manually operate it using a flathead screwdriver. The boot will then be free to open.

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