I am running the 276 version 2013/4 GLK 350 4 matic. Getting the Auxiliary Battery Malfunction message on start up consistently. I believe the Aux Battery is located in the passenger side rear of the trunk (right).

Does anyone have a part number for this auxiliary battery?

Does anyone have a source for this battery or its equivalent other than the dealer? Not afraid to use other than a genuine MB battery. Hear Bosch has one? Can I get one from AAA?

(BTW I am not a noobie and have searched on the Forum with no results.)

 

My 2013 uses a FIAMM 12 AH battery. Can't get to the part without removing the hold down bracket. Other members have found replacements at Autozone.

 

Here is a picture of the battery under the floor of the rear cargo area. Make sure you get an AGE battery.

 

I believe if you take the number off the battery you could order it anywhere , at maybe 1/3 a dealers price

 

Thanks for the help. I found this battery at an AutoZone about 100 miles away. They will not ship it to me!

 

ZZGlk, what does AGE stand for?

Thanks!

 

That is logical but impractical given my particular situation hence my inquiry. Do you know what this outlet and price would be?

 

Sorry. My fingers temporarily got disconnected from my brain. Meant to type AGM.

 

Search on Amazon

 

The reference MB part # "should" be 2115410001 which is a AGM battery - "Absorbent Glass Mat" which is vibration resistant - sealed - non spillable and maintenance free.

FCP Euro is about $135 for genuine MB.. double check correct part# with them.

There are China equivalents - BUT the $40 one is a standard SLA... and their Gel's at $70 are sh*t... best to go genuine MB at discounted price - Bosch AGM battery is about the same price with no advantage really..

 

Does anyone have the MB replacement procedure including Torx sockets needed, etc?

 

I replaced my 2014 GLK350 aux battery today with a NAPA #BAT AUX14. Retail price is $107 but with a friends AAA number I got a discount price of $82.50. The battery is made in the USA and is an exact fit.
By exact fit I mean that
a) The dimensions of the battery are the same as the MB battery and it is securely held by the fold over clamp and fits under the plastic cover with no interference
b) The terminals are in the correct location. The terminals are the correct size so the right angle stops on the leads sit over the terminal and the bolt is positioned over the threads in the battery and the battery and bolt thread sizes match.
c) There is a vent port in the side of the battery that accepts the vent tube in the same way as the original MB battery

Chinese replacement batteries are available on Amazon ~$40 but I decided not to go that direction after I read a review about a terminal post breaking after 1 month and also reading a couple of reviews saying that the leads that connect to the battery needed to be modified to make the battery work.

I first went to BatteriesPlus to buy a battery. They had some Chinese batteries similar to Amazon for $80 and a Duracell for $110. Before going to BatteriesPlus I had disassembled the covers of the battery so it was exposed and easily accessible. The clerk at BatteriesPlus brought the Duracell battery out to compare with the stock battery and he determined that the Duracell terminal was too large and the right angle stops on the battery lead would prevent the bolts in the lead from aligning with the threads in the battery terminal. He also pointed out that there was no vent port in the Duracell battery and he recommended getting the MB battery. There may be a compatible Duracell battery but they did not have it in stock.

This was late Saturday afternoon and I didn't want to wait until the dealer parts department opened on Monday so I ordered the NAPA battery online after I determined they had it in stock at the local store and I picked it up and installed in Sunday morning.

I'm glad I didn't try to make something fit that wasn't designed to do so.