Where is the aux battery in my 2010 w164 ML350 RWD
Thread Starter
Junior Member
Joined: Jul 2025
Posts: 39
Likes: 7
From: Florida
Where is the aux battery in my 2010 w164 ML350 RWD
I have searched her it said no thread. I have Googled it and it says 2 locations.
1, In the engine compartment next to the main battery. Nope
2: Next to the main battery under the passenger seat (where my main battery resides), nope, just the main battery
Any other known locations?
1, In the engine compartment next to the main battery. Nope
2: Next to the main battery under the passenger seat (where my main battery resides), nope, just the main battery
Any other known locations?
Senior Member
Joined: Oct 2023
Posts: 473
Likes: 240
From: New Hampshire
ML 63 AMG
Originally Posted by Wulfmann;[url=tel:9207363
9207363[/url]]I have searched her it said no thread. I have Googled it and it says 2 locations.
1, In the engine compartment next to the main battery. Nope
2: Next to the main battery under the passenger seat (where my main battery resides), nope, just the main battery
Any other known locations?
1, In the engine compartment next to the main battery. Nope
2: Next to the main battery under the passenger seat (where my main battery resides), nope, just the main battery
Any other known locations?
Senior Member
Joined: Oct 2023
Posts: 473
Likes: 240
From: New Hampshire
ML 63 AMG
Originally Posted by Wulfmann;[url=tel:9207499
9207499]So, I have to remove the passenger's seat? I had the main battery replaced and they removed the seat for that)
Thread Starter
Junior Member
Joined: Jul 2025
Posts: 39
Likes: 7
From: Florida
Thanks, that makes sense. I am not getting any notice of needing a new aux battery but like to anticipate.
I did buy one from the MB dealer for my 14 E350coupe. Cost me $175.00. I see them now on eBay as OEM, they look the same for like $50.00
I did buy one from the MB dealer for my 14 E350coupe. Cost me $175.00. I see them now on eBay as OEM, they look the same for like $50.00
MBWorld Fanatic!
Joined: Jun 2010
Posts: 2,755
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From: Emmett, ID, USA
2007 GL450
I tried it two different ways. First was just taking out the back two bolts of the seat track and tipping the seat forward. It sucked to get the battery out. Second time I took all 4 seat track bolts out and just lifted and moved the seat forward a foot or so, and that made it much easier to take the main battery out. Once that’s out of the way you can see the auxiliary battery.
Put a three foot nylon strap under the main battery, with the ends left above. Then, to remove the battery just pull up on the strap ends.
Senior Member
Joined: Oct 2023
Posts: 473
Likes: 240
From: New Hampshire
ML 63 AMG
Originally Posted by eric_in_sd;[url=tel:9207678
9207678[/url]]If the main battery had a handle, it would be easy to lift, even without removing the seat..
Put a three foot nylon strap under the main battery, with the ends left above. Then, to remove the battery just pull up on the strap ends.
Put a three foot nylon strap under the main battery, with the ends left above. Then, to remove the battery just pull up on the strap ends.
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MBWorld Fanatic!
Joined: Jun 2010
Posts: 2,755
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From: Emmett, ID, USA
2007 GL450
Yeah it did have a handle but you’re still lugging out a 60 pound battery without getting a good angle on it because the seat being there gets in the way. It was cake with the seat moved forward a foot or so. It’s just 2 more bolts at the front of the track so it’s a no brainer to do it that way.
None of the four batteries had a handle, at least as far as I can recall.
Never having unbolted the seat, I don't know if that is easier. I'm just saying what has worked for me.
Senior Member
Joined: Oct 2023
Posts: 473
Likes: 240
From: New Hampshire
ML 63 AMG
Originally Posted by eric_in_sd;[url=tel:9207892
9207892[/url]]For what it's worth, I've pulled the main battery five or six times without unbolting anything. Use the strap to lift the rear end, and then the battery just slides out to the rear.
None of the four batteries had a handle, at least as far as I can recall.
Never having unbolted the seat, I don't know if that is easier. I'm just saying what has worked for me.
None of the four batteries had a handle, at least as far as I can recall.
Never having unbolted the seat, I don't know if that is easier. I'm just saying what has worked for me.
MBWorld Fanatic!
Joined: Jun 2010
Posts: 2,755
Likes: 628
From: Emmett, ID, USA
2007 GL450
Conversely, my experience is with the GL; I am assuming the interiors are essentially the same. For all I know, the battery removal is tighter in the ML and my advice is bogus for that platform.
It is definitely not mechanical aptitude nor strength; I am terribly slow and my days of flexing manly muscles are long since past.
It is definitely not mechanical aptitude nor strength; I am terribly slow and my days of flexing manly muscles are long since past.
Last edited by eric_in_sd; Aug 31, 2025 at 10:51 PM.
Super Member
Joined: Jan 2007
Posts: 622
Likes: 202
From: CA
11 ML550, 95 Supra TT, 14 Audi S4
No difference on the ML, equally as miserable. I scoot the seat forward and up as much as possible and use a pry bar on the little "ledge" that goes around the perimeter of the battery to get the back end up high enough to get a hand under, lift and them slide the battery out. Never fun or easy and often takes multiple attempts to get it high enough to remove. Taking the seat out might be easier.
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Joined: Jan 2009
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From: V E G A S
1922 Ford Model T / no OBD
I just pulled H8 battery from my ML, to get to aux battery on side of it.
In my case, the floor flange is smaller, than battery bottom flange and I had to use screwdrivers to bend it a bit and make battery come out.
My battery has 2 small handles, so I used 1/2" pipe (good to have junk laying around) who I slide under the handles, lay front end on seat cross member and lifted the battery by rear pipe end.
At this moment I run out of hands as I needed 2 to operate screwdrivers, so I found matching block, that I put under rear of the pipe to hold the battery lifted and at this point I lifted the battery with screwdrivers pushed under it.
I have arthritism in both arms, so if I can do it, so can you.
I am thinking about adding nylons strap around the battery for extra lifting option.
In my case, the floor flange is smaller, than battery bottom flange and I had to use screwdrivers to bend it a bit and make battery come out.
My battery has 2 small handles, so I used 1/2" pipe (good to have junk laying around) who I slide under the handles, lay front end on seat cross member and lifted the battery by rear pipe end.
At this moment I run out of hands as I needed 2 to operate screwdrivers, so I found matching block, that I put under rear of the pipe to hold the battery lifted and at this point I lifted the battery with screwdrivers pushed under it.
I have arthritism in both arms, so if I can do it, so can you.
I am thinking about adding nylons strap around the battery for extra lifting option.
Last edited by kajtek1; Jan 25, 2026 at 10:30 AM.
