W211 AMG Discuss the W211 AMG's such as the E55 and the E63
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Aux Battery..?

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Old 10-19-2009, 10:26 AM
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No longer stock '06 E55, A3 3.2 Quattro, LRD4 HSE, R107 280SL
Aux Battery..?

So where is it and whats its rating....

And I did STFF... but surprisingly found bagel.
Old 10-19-2009, 10:50 AM
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cls 55 or FIAT Coupe T20v-6speed
located below the AC evaporator

Old 10-19-2009, 10:57 AM
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E-ZGO 53hp., 1999 E 430 sport, 2004 E 55, 2008 Tahoe LTZ on 24"s
Originally Posted by stevebez
So where is it and whats its rating....

And I did STFF... but surprisingly found bagel.
Steve on our US cars it is on the passenger side, under a cover by the windshield washer fill. In the pic it is under my shop light. I don't recall what the specs are but a guy could probably get a better than stock one for less $ than what MB charges.
Aux Battery..?-dcp41102.jpg
Old 10-19-2009, 12:35 PM
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can't find the thread explaining what size battery that is. If I remember correctly, you can buy a motorcycle battery and it drops right in...
Old 10-19-2009, 12:58 PM
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No longer stock '06 E55, A3 3.2 Quattro, LRD4 HSE, R107 280SL
Thanks Guys...

So how is this charged up? - is it in paralel with the main battery or completely seperately controlled / charged?

For example if I charge my main battery with all car leads off, only it charges - if I leave the car leads on will this battery be charged too, or do I specifically need to charge it in isolation?
Old 10-19-2009, 04:05 PM
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found it:

https://mbworld.org/forums/2764501-post47.html
Old 10-19-2009, 07:24 PM
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cls 55 or FIAT Coupe T20v-6speed
Originally Posted by stevebez
Thanks Guys...

So how is this charged up? - is it in paralel with the main battery or completely seperately controlled / charged?

For example if I charge my main battery with all car leads off, only it charges - if I leave the car leads on will this battery be charged too, or do I specifically need to charge it in isolation?

no, the aux batt is charged by the alternator.
it is independent from the main batt, therefor eif you charge the main batt, the aux will not get charged.
Aux batt kicks in only when the main battery voltage goes below 11Volts and this function is regulated by a specific control module located close to your spare wheel/rear lights.

you can replace it with whatever 12V battery you want, who fits inside there. just make sure it has at least that peak amperage (170 A).

btw, ... if you need, you can fit into the car also a third battery, better if connected in series after the main battery, provided you put in between a relais or another multiple battery manager, like for example the old Orion MBR70 ... or something newer like a CPSr Rockford, a Jacobs Accuvolt, an Helix XXL ..
Old 10-20-2009, 06:12 AM
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No longer stock '06 E55, A3 3.2 Quattro, LRD4 HSE, R107 280SL
Sounds like you need serious amps to drive your amps Marco!!!
Old 10-20-2009, 12:06 PM
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cls 55 or FIAT Coupe T20v-6speed
Originally Posted by stevebez
Sounds like you need serious amps to drive your amps Marco!!!

yeah ...
but I gave up the idea of a third batt

.. now I am working on a project for a very special lithium replacement of the main battery, able to put out at least thousands ampere for long enough

final result, if positive, will be LESS weight than our stock batt

will see .. if we can come up with the special battery control module we need to design ...


then, I'll be ready even for .... a KERS
Old 10-20-2009, 03:46 PM
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No longer stock '06 E55, A3 3.2 Quattro, LRD4 HSE, R107 280SL
hahha extra 80hp at push of a button would be nice......
Old 10-08-2021, 05:14 PM
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2005 BENZ E320 CDI OM648
I ordered a AGM Motorcycle battery AJC Brand replacement from Walmart $65 CAD.
This battery will work as an Auxiliary battery for 2005 E320 W211 OM648.
The only issue is the height is a couple of inches shorter than the factory but i used a piece of rubber to take up the space. Been using it for a month and no issues.

https://www.walmart.ca/en/ip/All-Mot...t/5Z02MBWF9C0X

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