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How to Remove and Change the Backup Battery of a Mercedes

Model: Mercedes Mercedes Various
Part: Battery

Video tutorial

The backup battery (or auxiliary battery) powers electrical equipment as a supplement to the main starting battery and mainly helps with the numerous electrical services that a modern vehicle requires. Auxiliary batteries are typically installed in high-end models such as Mercedes, BMW, or Audi, to ensure the proper functioning of all electrical services.

Here’s how to replace it in a Mercedes: remove the lower pillar on the passenger side, then take off the upper part of the cover under the glove compartment, as if accessing the fuse box. In a small compartment on the left, you will find a small black box. This is our auxiliary battery, which can be easily found on all e-commerce platforms and costs between £18 and £20.


Updated on 4 August 2026 by ScegliAuto


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by ScegliAuto

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