ML400 main battery change
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Joined: Apr 2012
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2012 ML350
ML400 main battery change
Does anyone have a picture/video showing how to remove the OEM battery from a ML400.
I see them for ML350's and it seems my battery is installed differently (90 degrees?) from the ML400
I see them for ML350's and it seems my battery is installed differently (90 degrees?) from the ML400
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Member
Joined: Apr 2012
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2012 ML350
(any value to putting a small 12 v battery across the charging bolts under the hood to keep the computer energized when replacing the main starter battery? (or will the auxiliary battery do that job))
Newbie
Joined: Dec 2022
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ml400
I would purchase a device to maintain power during a battery change if you plan on doing this yourself. Some devices will plug in through the OBD port, while other outdated devices used the lighter/charger. That's what I would do.
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From: unbegrenzt
2017 GLE350 4MATIC
What brand battery did you install? I can't find the Bosch battery in town, but Costco has the AGM Interstate (identical form factor to the MB battery) readily available. I have had great success with Interstate batteries in my other cars, but have never bought their AGM before.
(any value to putting a small 12 v battery across the charging bolts under the hood to keep the computer energized when replacing the main starter battery? (or will the auxiliary battery do that job))
(any value to putting a small 12 v battery across the charging bolts under the hood to keep the computer energized when replacing the main starter battery? (or will the auxiliary battery do that job))
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Joined: Jan 2016
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From: In the Shadow of the Tetons
2013 ML350 Bluetec
There is an absolute zero chance I'd allow a lacky from autozone change a battery in my '87 jeep to say nothing of my (somewhat more complicated) mercedes.
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2013 ML550 US spec. Air+Offroad pkg
I agree with Chassis. Got my MB branded AGM for maybe $10 more than the correct Bosch online. I dont think the interstate has the little vent nipple either. Since sits inside cabin, offgassing is vented thru a little tube. Replace the Aux battery at same time (same deal as main, maybe $5 more at dealer).
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Thread Starter
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Joined: Apr 2012
Posts: 80
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2012 ML350
Does the auxiliary battery keep the computer and related systems powered while the main starting battery is removed?
I don't want the emissions system to reset (inspection will fail until the car is driven through its cycles).
I can put a 12.5 volt across the battery posts in the engine bay, but if the auxiliary battery is doing the same thing, no need.
I don't want the emissions system to reset (inspection will fail until the car is driven through its cycles).
I can put a 12.5 volt across the battery posts in the engine bay, but if the auxiliary battery is doing the same thing, no need.
Out Of Control!!
Joined: Sep 2018
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From: unbegrenzt
2017 GLE350 4MATIC
Thread Starter
Member
Joined: Apr 2012
Posts: 80
Likes: 7
2012 ML350
All done .... It was a pain in the @#)@%$, but straight forward.
The only issue is the weight and awkwardness of it all. The videos made a big difference - which gave me no surprises.
I installed an Interstate AGM group 49/H8 900CA replacement. It is identical in form factor to the OEM Mercedes.
It has the vent tube and it fit perfectly as expected. During battery removal, I had the new battery on a tender which brought it up to full charge.
After installation and starting the car - WOW - I am so glad I did this. The car cranked with zero effort compared to my 7 year old OEM which was clearly on its last legs.
Some tips if you use Interstate:
1. Keep the Mercedes red positive terminal battery cover which came with the OEM. It is slightly 'deeper' than the Interstate cover plate and will better cover the terminal wire bolt.
2. Be sure to use the vent plug which you have to bend off and remove from the Interstate positive terminal cover and plug the vent hole on the opposite side (next to the "+" terminal).
The vent tube will plug into the vent hole by the negative terminal as before.
Total cost = $184
The only issue is the weight and awkwardness of it all. The videos made a big difference - which gave me no surprises.
I installed an Interstate AGM group 49/H8 900CA replacement. It is identical in form factor to the OEM Mercedes.
It has the vent tube and it fit perfectly as expected. During battery removal, I had the new battery on a tender which brought it up to full charge.
After installation and starting the car - WOW - I am so glad I did this. The car cranked with zero effort compared to my 7 year old OEM which was clearly on its last legs.
Some tips if you use Interstate:
1. Keep the Mercedes red positive terminal battery cover which came with the OEM. It is slightly 'deeper' than the Interstate cover plate and will better cover the terminal wire bolt.
2. Be sure to use the vent plug which you have to bend off and remove from the Interstate positive terminal cover and plug the vent hole on the opposite side (next to the "+" terminal).
The vent tube will plug into the vent hole by the negative terminal as before.
Total cost = $184
