E-Class (W212) 2010 - 2016: E 350, E 550

Auxiliary battery replacement for 2014 E350

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Old 10-21-2019, 09:18 PM
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E350
Auxiliary battery replacement for 2014 E350

Where is the auxiliary battery located on the 2014 E350? I’ve seen people post in the trunk, and some people post by the driver side dash area. Can someone help?
Old 10-21-2019, 09:38 PM
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2017 GLE350 4MATIC
Welcome! Please post a photo of the E350.

WIS says it's in the left (driver's) end of the instrument panel, accessed by removing the end cover of the instrument panel, and a cover outboard of the brake pedal in the pedal box area.
Old 10-22-2019, 11:56 AM
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bone stock E55 AMG
moved to W212 forum...
it should be by passenger side firewall under the hood...
Old 10-22-2019, 07:49 PM
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2014 E-350 4 MATIC
Originally Posted by MJ50
moved to W212 forum...
it should be by passenger side firewall under the hood...
That is the main battery location. He said AUX....oops. This battery is located in the spare tire well in the trunk.
Old 10-22-2019, 08:02 PM
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bone stock E55 AMG
didn't know W212 is opposite from W211...

Old 10-22-2019, 08:10 PM
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$115 at FCPEuro with lifetime warranty - https://www.fcpeuro.com/products/mer...mer-0009829308
Old 10-22-2019, 10:08 PM
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thanks

Originally Posted by MJ50
didn't know W212 is opposite from W211...

https://youtu.be/6t1NvtbFEAc

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Old 10-23-2019, 09:16 AM
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'71 Pinto
Search part # 0009829608, see attachment.
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install additional battery.pdf (269.6 KB, 361 views)
Old 10-31-2019, 06:38 PM
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Got "Auxiliary Battery Malfunction" last week. Dealer replaced Auxiliary Battery under warranty yesterday. Part number 000-982-96-08 is called "STARTER BATTERY",


Old 10-31-2019, 07:29 PM
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the auxiliary battery is located on the passenger side of trunk for a 2014 E350 sport. I do not know if it is the same for Luxury model but I changed mine and it was in the trunk.
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Old 08-07-2022, 12:45 PM
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Mercedes 2014 E350 Estate (S212)
Equivalents batteries

Originally Posted by E55 KEV
$115 at FCPEuro with lifetime warranty - https://www.fcpeuro.com/products/mer...mer-0009829308

Does anyone know the difference for the battery designations? Essentially we can buy group 400 batteries with 200 CCA, otherwise listed or marketed as AUX14 batteries. These are almost identical to sports or motorcycle batteries as in CYTX14-BS or CYTX or ATX batteries, here is an example..

Interstate Batteries CYTX14-BS 12V 12Ah Powersports Battery Cycle-Tron Rechargeable Replacement AGM Battery for Motorcycles, ATV, UTV, Scooters, Snowmobiles, Batteries - Amazon Canada Interstate Batteries CYTX14-BS 12V 12Ah Powersports Battery Cycle-Tron Rechargeable Replacement AGM Battery for Motorcycles, ATV, UTV, Scooters, Snowmobiles, Batteries - Amazon Canada

This looks essentially identical even to the voltage and dimensions, is this ok to use instead?
Old 08-07-2022, 12:52 PM
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2017 GLE350 4MATIC
Buying electrical components from the dealer is always the best option. Why are you looking elsewhere? To save money? If you are in GTA, MB parts availability should best the best there is in Canada.
Old 08-07-2022, 01:05 PM
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MY'14 W212 M276 3.5NA @55kMi
almost similar...

Make sure your AUX replacement has a VENT HOLE to pipe hydrogen outside.

This detail is a non-issue for outdoor motorsport vehicles, for cars it's a must have.
​​​​​​
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Old 08-07-2022, 01:13 PM
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Mercedes 2014 E350 Estate (S212)
Originally Posted by chassis
Buying electrical components from the dealer is always the best option. Why are you looking elsewhere? To save money? If you are in GTA, MB parts availability should best the best there is in Canada.
yes, having problems everyone seems out of stock, any recommendations on whom to call?
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Old 08-07-2022, 02:18 PM
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Originally Posted by chassis
Buying electrical components from the dealer is always the best option. Why are you looking elsewhere? To save money? If you are in GTA, MB parts availability should best the best there is in Canada.
The dealer is the most expensive to buy a battery from. They state you need to have the battery kept charged while changing the battery and they charge you for that plus the high cost of batteries there. On my E350 I took batteries out went to pep boys and came back and put them it. NO loss of anything while batteries were out. Pep boys would have taken them out and replaced them for no cost for labor. Instead of dealers they should be called stealers. Cannot understand why you would suggest using the Stealer for a simple battery change.
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Old 08-07-2022, 02:55 PM
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MY'14 W212 M276 3.5NA @55kMi
good practice! ✌️

Originally Posted by dbldpr
The dealer is the most expensive to buy a battery from. They state you need to have the battery kept charged while changing the battery and they charge you for that plus the high cost of batteries there. On my E350 I took batteries out went to pep boys and came back and put them it. NO loss of anything while batteries were out. Pep boys would have taken them out and replaced them for no cost for labor. Instead of dealers they should be called stealers. Cannot understand why you would suggest using the Stealer for a simple battery change.
many people are afraid to upset grimlins by poping their hood. Melting a wrench is a long lived mistery that lurks around to deal with (-) & (+)

Rebooting these cars once a month is a very good practice to prevent bug corps from hogging memory🤘
Old 08-07-2022, 03:08 PM
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Originally Posted by dbldpr
The dealer is the most expensive to buy a battery from. They state you need to have the battery kept charged while changing the battery and they charge you for that plus the high cost of batteries there. On my E350 I took batteries out went to pep boys and came back and put them it. NO loss of anything while batteries were out. Pep boys would have taken them out and replaced them for no cost for labor. Instead of dealers they should be called stealers. Cannot understand why you would suggest using the Stealer for a simple battery change.
To get the right part, fresh. I DIY most things automotive so Pep Boys' or other installation service has no bearing on my decision.

Buying aftermarket electrical parts is false economy.
Old 08-07-2022, 03:42 PM
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Mercedes 2014 E350 Estate (S212)
Originally Posted by CaliBenzDriver
Make sure your AUX replacement has a VENT HOLE to pipe hydrogen outside.

This detail is a non-issue for outdoor motorsport vehicles, for cars it's a must have.
​​​​​​
DELETED

Last edited by nateo83; 08-08-2022 at 11:29 PM. Reason: wrong info
Old 08-07-2022, 04:11 PM
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Originally Posted by nateo83
yes, having problems everyone seems out of stock, any recommendations on whom to call?
I don't. I would all all MB dealers within a two hour driving radius of your location. Maybe from London to Ottawa.
Old 08-08-2022, 11:29 PM
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Mercedes 2014 E350 Estate (S212)
Originally Posted by nateo83
they’re AGM batteries so shouldn’t need a vent hole - that I can see however.
Ohhh am I wrong. So to answer my own question...... the AUX14 group size 400 battery that sits in our Mercedes appears to have a vent hole in it. The ATV and Motorcycle batteries do not. Looks like I'm buying from Interstate or Canadian Tire here if the dealership is too expensive...

Solved...
Old 08-09-2022, 01:13 AM
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welcome !

Originally Posted by nateo83
Ohhh am I wrong. So to answer my own question...... the AUX14 group size 400 battery that sits in our Mercedes appears to have a vent hole in it. The ATV and Motorcycle batteries do not. Looks like I'm buying from Interstate or Canadian Tire here if the dealership is too expensive...

Solved...
that a boy ! 👏
Many people use motorcycle batteries because they look appealing to them.

Glad we could help you enjoy a safe ownership.
We make suggestions, then people take decisions.


FYI: the W212 AUX batt can off gaz under marginal Benz operations.
When the power yoyo bleeds 90Amp from Main,
the AUX cuts in to help before voltage jumps with 90Amp charge... kills both batts.

Last edited by CaliBenzDriver; 02-04-2023 at 05:37 PM. Reason: more 4 less

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