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2010 E350 (W212) Aux Battery Replacement

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E-Class (W212) 2010 - 2016: E 350, E 550
Old 06-04-2015, 08:14 PM
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2010 E350 (W212) Aux Battery Replacement

 
Old 12-16-2014, 02:41 PM
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Originally Posted by GregTR View Post
Battery is actually under the instrument cluster not under the seat.
The attachment is exactly right. Followed it and change it out.
The only thing gone is the garage control. Need to set up again.

Thanks.
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Old 02-11-2015, 03:49 PM
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2010 E350 Auxiliary Battery Seller

Anybody knows any online sellers for replacement auxiliary battery for my 2010 E350 since dealer price is too expensive. Thanks for your help.
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Old 02-11-2015, 05:39 PM
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Originally Posted by ernie726 View Post
Anybody knows any online sellers for replacement auxiliary battery for my 2010 E350 since dealer price is too expensive. Thanks for your help.

I bought mine @ Newegg
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Old 02-11-2015, 05:46 PM
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My brother just replaced his from local MB parts.
part number N000000004039

Big Time Battery has a listing under Newegg for $12.99
http://www.newegg.com/Product/Produc...4278-_-Product

That is a good price if it lasts.

Last edited by Taiwanese; 02-16-2015 at 11:03 AM. Reason: add more info
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Old 02-11-2015, 11:45 PM
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This indicates that the second battery is specific to the models named right?
My 2011 E350 4Matic Wagon with the 272 engine no ECO S/S has only one battery from what I have been told by me dealer parts guy who is pretty well informed.
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Old 02-12-2015, 10:28 AM
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Originally Posted by Alex.currie44 View Post
2011 E350 4Matic Wagon with the 272 engine no ECO S/S has only one battery from what I have been told by me dealer
MY11 e3504matic wagon: 12V/80AH battery in engine compartment, and additional transmission selector 1.2AH backup battery below instrument panel.
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Old 02-12-2015, 11:39 AM
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Thanks. I will bug him again.
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Old 02-12-2015, 01:05 PM
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Thanks for the input. He has recanted.
He supplied part numbers as well for my car.
Main Battery 000-982-21-08-26
Small backup is 000000-004039
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Old 02-15-2015, 03:55 PM
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Thanks guys (Taiwanese and swwags) for the online info for the Auxiliary Battery for my 2010 E350, I just placed the order.
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Old 02-16-2015, 11:04 AM
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Originally Posted by ernie726 View Post
Thanks guys (Taiwanese and swwags) for the online info for the Auxiliary Battery for my 2010 E350, I just placed the order.
My earlier post was a little misleading. My brother bought his from local MB parts.
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Old 02-27-2015, 09:52 AM
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anyone know the function of the Auxiliary battery on the 2010 E550?

can someone please tell me what the auxillary battery on the E550 does. i have noticed that my Air condition is not working even after topping up on the Air condition gas. The dashboard says Auxiliary battery malfuncion and i am wondering whether the Air condition's inability to function has anthing to do with the battery.
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Old 03-20-2015, 01:44 PM
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2010 E350 Auxiliary Battery Malfunction

I installed the new auxiliary battery I bought from Newegg for my 2010 E350 but the "Auxiliary Battery Malfunction" still shows up. Any ideas how fix this problem?
Thanks for any help.
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Old 03-30-2015, 01:47 PM
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Help!

Hello, I am a tad bit late to this but with my search this is the only useful information I've gotten regarding this issue! I also am getting a "auxiliary battery malfunction" light on my 2011 E350 and have purchased a new one, (http://www.ebay.com/itm/190716744381...S:1123&vxp=mtr) used the pdf. provided to install it but when we got in there the batteries were two different sizes. Can anyone provide me with a part number or picture as to what I am supposed to have?? Anything would help greatly as I've kinda been ignoring this issue and need not to!
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Old 03-30-2015, 02:08 PM
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What is your VIN (PM if you prefer)?
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Old 09-27-2015, 08:54 AM
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Where are the instructions pics, etc
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Old 09-27-2015, 08:57 AM
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Part number 000000004039 for the 2011 E350
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Old 09-27-2015, 09:09 AM
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Originally Posted by MWmp5 View Post
Where are the instructions pics, etc
look at the 8th post.
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Old 09-27-2015, 08:24 PM
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That's it!! Thanks thefish, Mike
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Old 01-01-2016, 01:11 AM
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Thank you all for your valuable feedback. Replacing the auxiliary battery isn't hard but it looks like difficult for some who don't work on cars very often. The instructions that were provided on post $8 aren't that helpful in my opinion. I found these instructions that show you step by step with pictures and videos on how to replace the auxiliary battery on an E Class. There is also a list of aftermarket batteries that will fit.

Here is the link if anyone in the future needs help.
http://www.mercedesmedic.com/diy_aux...-instructions/
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Old 07-15-2016, 11:35 PM
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Originally Posted by Alex.currie44 View Post
Thanks for the input. He has recanted.
He supplied part numbers as well for my car.
Main Battery 000-982-21-08-26
Small backup is 000000-004039
Which starter battery can you buy when the OEM part number
000 982 21 08 says it is discontinued?
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Old 10-01-2016, 11:24 PM
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Thanks for the posts; they provided good information that allowed me to change the Aux battery in my 2012 E350 in about 10 minutes. I ordered the PowerStar battery from New Egg for $12.99. The PowerStar battery is a bit taller and narrower, but seemed to fit fine in the bracket. Here are a few photos showing the access panels and the two batteries side by side. The garage door remote codes were unaffected after replacing the battery.

2010 E350 (W212) Aux Battery Replacement-l1000959_zpswxazb7ga.jpg

2010 E350 (W212) Aux Battery Replacement-l1000963_zpsxbqmcqkp.jpg

2010 E350 (W212) Aux Battery Replacement-l1000983_zpsbzwlxvgg.jpg

2010 E350 (W212) Aux Battery Replacement-l1000981_zpsx0br3pg8.jpg

Last edited by Six_Speed; 10-01-2016 at 11:32 PM.
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Old 10-03-2016, 10:40 AM
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oh wow , never knew about this battery lol
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Old 12-01-2016, 07:47 PM
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I just did this too and GrgeTR's instructions were right on target. Thanks Greg. I also bought the New Egg battery. The size was close enough to fit just fine... One thing though, I didn't end up doing step 4 and just left the brackets connected while I replaced the battery (I couldn't get them to unsnap).

Also, all the other posts on thread about the location of the main battery threw me off for a while. I wish people would have kept this threat on subject, which is the replacement of the auxiliary battery. NOT the main battery.
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Old 12-17-2016, 09:58 PM
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I just did this today.
All the instructions were helpful but just to add a few things from my experience,
You need to remove the 3 torx screws from the under dash plastic trim before you start yanking on the plastic.
Once you pull it down, there is the cable that connects to the hood release.
I didn't see a way to unhook or detach the cable so I left it on and squeezed my arm in to get to the battery.

You must unbolt #5 to release the battery bracket that holds the battery.

Hope that helps the next person who needs to do this DIY.
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Old 12-18-2016, 11:09 AM
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Why does MB/DAG make things so hard? The cabin filter is another one. I have done DIY in past on Asian and American cars and never as complicated as MB.
Not sure, but I think you can get the battery from Adavanced Auto, but they will not install it. They will install the main or "starter" battery free of charge.
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