E350 mercedes Benz
I did a bit of research, and it appears that the 2010 e350 has the auxiliary battery is in the same place as yours. The link below is to a PDF file showing where it is. I hope this helps! https://www.benzworld.org/attachments/install-additional-battery-2-pdf.1939666/
In the trunk, right of the spare, you'll see a floor panel. The Aux. battery is under that cover.
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