Auxiliary battery W 212

[jinglis]

Today my auxiliary battery malfunction appeared on my display. I looked on Youtube and found how to replace it, seems in my E 350 base, 2011, it is located on the drivers side on the side, which required opening the drivers door and removing a panel to gain access to the battery. They said part number N000000004039 and showed a picture of it before installation.
I have checked every MB parts site and when I put in that number nothing comes up, when I put in auxiliary battery W 212, 2011 I can't find any part listed anywhere. Any advise on where I can get this part would be great. I also heard there are several different locations in the car for the same model, newer models it is in the trunk, so I am wondering how do I find out where it is on my car? Suppose I can just pry the panel open and see if I can see it in there on the drivers side.
Thanks.

Jim

 

[AMGeed]

The Part number for the W212 E350 Aux battery are as follows. All numbers are correct but are updated over time.

A 21 154 100 01 A 00 098 293 08 A 00 098 296 08 #500 in diagram FG 212.056 - BATTERY,STARTER/ALTERNATOR CABLE > EPC Online > WebAutoCats.com Mercedes parts catalog. BATTERY,STARTER/ALTERNATOR CABLE. Spare parts catalog EPC Online. webautocats.com I have a 2014 model W212 and the Aux battery is in the boot on the rhs under the carpet.

 

[jinglis]

Thank you that helps.