E-Class (W212) 2010 - 2016: E 350, E 550
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No rear battery? 10' E550 air matic

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Old Jul 17, 2020 | 04:00 AM
  #1  
dkGoodrich's Avatar
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From: Central KY, South FL
W212 E550
No rear battery? 10' E550 air matic

Trying to find the rear battery, it's not by the spare tire like I've seen with others on here

Any guidance before I pull out all the panels?

Thank you


Last edited by dkGoodrich; Jul 17, 2020 at 04:04 AM.
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Old Jul 17, 2020 | 12:04 PM
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Originally Posted by dkGoodrich
Trying to find the rear battery, it's not by the spare tire like I've seen with others on here

Any guidance before I pull out all the panels?

Thank you
Might be in front of passenger under the hood.
if i remember correctly it depends on when it was made until certain date
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Old Jul 17, 2020 | 12:07 PM
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Originally Posted by dkGoodrich
Trying to find the rear battery, it's not by the spare tire like I've seen with others on here

Any guidance before I pull out all the panels?

Thank you
Yours may be behind the left dash panel, that's where they are in both my cars.
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Old Jul 17, 2020 | 01:35 PM
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Main battery in front at passenger firewall. Auxiliary battery in driver side dash area. Nothing in the trunk.
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Old Jul 17, 2020 | 01:50 PM
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Thanks everyone

I knew there is a primary and aux battery, I just thought there was a battery in the trunk for the air suspension.

Kinda sucks because I am installing a amp and sub and I really don't want to run a power wire the length of the car
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Old Jul 17, 2020 | 06:42 PM
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Originally Posted by dkGoodrich
Thanks everyone

I knew there is a primary and aux battery, I just thought there was a battery in the trunk for the air suspension.

Kinda sucks because I am installing a amp and sub and I really don't want to run a power wire the length of the car
Don't you have a 12V power in the trunk?
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Old Jul 17, 2020 | 06:49 PM
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Originally Posted by Arrie
Don't you have a 12V power in the trunk?

​​​​​​I'm not sure honestly, I've seen small power wires but so far I haven't seen any thing that's a decent size. I'll keep checking however.
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Old Jul 17, 2020 | 06:50 PM
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I still love the look of the W212 Especially those DRL's! those were so rad back in 2010.
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Old Jul 17, 2020 | 08:13 PM
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Originally Posted by dkGoodrich
​​​​​​I'm not sure honestly, I've seen small power wires but so far I haven't seen any thing that's a decent size. I'll keep checking however.
I mean the cigarette lighter socket.
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Old Jul 18, 2020 | 12:41 AM
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Originally Posted by hyperion667
I still love the look of the W212 Especially those DRL's! those were so rad back in 2010.
I've always really liked em, sharp cars for sure.




Originally Posted by Arrie
I mean the cigarette lighter socket.
I'm not sure I could power an amp off that honestly, but it does have a 12v socket back there
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Old Jul 18, 2020 | 12:04 PM
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Originally Posted by dkGoodrich
I've always really liked em, sharp cars for sure.






I'm not sure I could power an amp off that honestly, but it does have a 12v socket back there
These outlets usually have quite high amp fuses like 30A I have seen in some cars. If it is 30A it can carry 360W power. If your amplifier takes more than this then it is not strong enough.

That picture looks exactly like my car for model and colors, which is 2010 E550 with the main battery in the trunk. My car, I think, actually is a 2009 model as this car was in Europe already in 2009. My car was made in May 2009 so it probably is just that, which explains the battery in the trunk.

has been by far the best car so far that I ever owned unless the 2013 S550 proves better, which I doubt.
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Old Jul 18, 2020 | 06:08 PM
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Originally Posted by dkGoodrich
Thanks everyone

I knew there is a primary and aux battery, I just thought there was a battery in the trunk for the air suspension.

Kinda sucks because I am installing a amp and sub and I really don't want to run a power wire the length of the car
The trunk battery is for ECO stop, who come with 2014 models.
You have small battery in dash for electric gear shifting backup.
Even you'd have trunk battery, I would not hook up powerful amplifier to it.
That battery is backup or emergency battery with special charging program, so hooking up additional power draw to it has potential for lot of mess.
But my 2014 model has small electric panel in the trunk, that runs of main battery. I wonder if you might have it as well?
If not, run heavy wire from main battery - starting with fuse.
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Old Jul 19, 2020 | 09:37 AM
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Originally Posted by dkGoodrich
I've always really liked em, sharp cars for sure.






I'm not sure I could power an amp off that honestly, but it does have a 12v socket back there
Oh man you need some side markers.......clear or smoked would do
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Old Jul 20, 2020 | 11:35 PM
  #14  
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Originally Posted by Arrie
These outlets usually have quite high amp fuses like 30A I have seen in some cars. If it is 30A it can carry 360W power. If your amplifier takes more than this then it is not strong enough.

That picture looks exactly like my car for model and colors, which is 2010 E550 with the main battery in the trunk. My car, I think, actually is a 2009 model as this car was in Europe already in 2009. My car was made in May 2009 so it probably is just that, which explains the battery in the trunk.

has been by far the best car so far that I ever owned unless the 2013 S550 proves better, which I doubt.
I tried tapping into the 12v outlet, unfortunately it blew the fuse after a few min.

So I soldered a 10 gauge wire onto rear fuse box main feed, ran it to a circuit breaker, then to a 1 farad capacitor, then to a 360watt mono block, powering a 10" ported sub. Wired RCA's into the factory amp. Tested it so far for about an HR and it's working great.

Originally Posted by kajtek1
The trunk battery is for ECO stop, who come with 2014 models.
You have small battery in dash for electric gear shifting backup.
Even you'd have trunk battery, I would not hook up powerful amplifier to it.
That battery is backup or emergency battery with special charging program, so hooking up additional power draw to it has potential for lot of mess.
But my 2014 model has small electric panel in the trunk, that runs of main battery. I wonder if you might have it as well?
If not, run heavy wire from main battery - starting with fuse.
Thanks for the insight man! I ended up soldering a wire onto the rear fuse boxes main feed, seems to work great so far

Originally Posted by hyperion667
Oh man you need some side markers.......clear or smoked would do
Yes I do, and I'm about to order some

Ordering these wheels pictured below as soon as I decide on color (black and polished or grey and polished), then carbon front lip, carbon trunk duck bill, carbon rear bumper accents etc




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