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Where is the Auxiliary Battery Located in a Mercedes S-Class?

Model: Mercedes Classe S W221, MK 5 - Years: 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
Part: Battery

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Video tutorial

In this video, you can see where the auxiliary battery is located in a Mercedes S-Class, useful in case you need to replace or simply recharge it. As shown, the battery is positioned inside the trunk, specifically on the right side of the partition wall with the cabin.

To access it, simply open the trunk, remove the bottom panel, and then the cover of the wall itself.

To replace the battery, you will need to remove the supporting bracket and disconnect both terminals, always starting with the negative.


Updated on 13 July 2026 by ScegliAuto


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