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Marty
Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 54022
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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S550: Where is the AUX batteryu located at in the trunk of

Customer Question

Where is the AUX batteryu located at in the trunk of my 2008 Mercedes S550?
I unscrewed and took out all the trunk panels and all I see is the spare tire.
My aux battery is 7 years old and not hold a charge any longer.
I am getting "Please start the engine. Otherwise COMMAND will shut off in 3 minutes."
This message I get any time the radio or CD/DVD player on FOR 3 OR 4 MINUTES and the engine is off.
WHERE IS THE AUX BATTERY IN THE TRUNK? i WANT TO REPLACE IT
Submitted: 2 years ago.
Category: Mercedes
Expert:  Marty replied 2 years ago.
Hi, the battery in the trunk is located at the front of the trunk. Copy and paste the link below for the instructions for replacing the battery.
https://www.mediafire.com/folder/29g7nytuc2324/Replace_Auxiliary_Battery
Let me know if you need anything else.
Marty