Here you will see what is involved to replace the Main Battery in the trunk on my 2008 Mercedes-Benz E350 which is a W211 Chassis. This procedure should work on most variations of the W211.
The battery can be found directly from Mercedes Benz, Interstate (maker of Mercedes batteries) or most auto parts stores or places like Costco.
Use of the material shown in this video is to be used at you own risk as I am not responsible for any damage done to your vehicle from use of this information. This procedure should only be done by trained and experienced automotive technicians.
