Can I change my E550's main battery myself?
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2020 GLS450 (wife) / 2024 Ford Bronco (mine) / 2014 VW Tiquan (son)
I think it’s about time for a new main battery in my W212 (sedan / 350). Everyone fine with aftermarket or should I stick with OEM. It’s 6 years old and noticed last night that the radio won’t stay on for more than 15 seconds or so without the engine running (which is a first). I suspect the battery is getting close....
I’ve replaced the auxiliary a couple of times over the past 3 years, no big deal. It’s relatively new (yet I hardly ever get the green light for eco start/stop in general).
MB or aftermarket? And what’s this “reset” business about? Mine is a 2014.
many thanks!!!
I’ve replaced the auxiliary a couple of times over the past 3 years, no big deal. It’s relatively new (yet I hardly ever get the green light for eco start/stop in general).
MB or aftermarket? And what’s this “reset” business about? Mine is a 2014.
many thanks!!!
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2019 G70 6MT & 2022 Ford Maverick XL
You should be able to replace it yourself without issue, and aftermarket should be fine. Note - the eco stop/start system is dependent on the main battery, it is not tied to the Aux battery so if that system is never active then yes that is a sign of a weak main battery.
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I think it’s about time for a new main battery in my W212 (sedan / 350). Everyone fine with aftermarket or should I stick with OEM. It’s 6 years old and noticed last night that the radio won’t stay on for more than 15 seconds or so without the engine running (which is a first). I suspect the battery is getting close....
I’ve replaced the auxiliary a couple of times over the past 3 years, no big deal. It’s relatively new (yet I hardly ever get the green light for eco start/stop in general).
MB or aftermarket? And what’s this “reset” business about? Mine is a 2014.
many thanks!!!
I’ve replaced the auxiliary a couple of times over the past 3 years, no big deal. It’s relatively new (yet I hardly ever get the green light for eco start/stop in general).
MB or aftermarket? And what’s this “reset” business about? Mine is a 2014.
many thanks!!!
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Joined: Oct 2010
Posts: 5,141
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From: Southern US
2010 E550, 273 Engine: 2012 S550, 278 Engine
I think it’s about time for a new main battery in my W212 (sedan / 350). Everyone fine with aftermarket or should I stick with OEM. It’s 6 years old and noticed last night that the radio won’t stay on for more than 15 seconds or so without the engine running (which is a first). I suspect the battery is getting close....
I’ve replaced the auxiliary a couple of times over the past 3 years, no big deal. It’s relatively new (yet I hardly ever get the green light for eco start/stop in general).
MB or aftermarket? And what’s this “reset” business about? Mine is a 2014.
many thanks!!!
I’ve replaced the auxiliary a couple of times over the past 3 years, no big deal. It’s relatively new (yet I hardly ever get the green light for eco start/stop in general).
MB or aftermarket? And what’s this “reset” business about? Mine is a 2014.
many thanks!!!
Anyway, AutoZone installed the battery and the guy used some sort of a “battery” connected to the OBD port while the main battery was disconnected. He said this prevents the car computers from losing memory.
A few months later I went to get the car inspection but they could not read the codes. Turned out the fuse for the OBD port was blown. I think that “battery” that AutoZone guy used caused this.
I have disconnected my main battery several times after that when working on the car and never had any problems and have not needed to reset anything else but seat memory positions.
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Joined: Dec 2016
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E250 Diesel
same here. I did it myself in about 20 minutes. I needed a helper to pull the existing wires out of the way when I dropped the battery in. All memory settings came back normal when I restarted the car.
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Joined: May 2015
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From: Miami, FL
2003 CL 600
You should be able to replace it yourself without issue, and aftermarket should be fine. Note - the eco stop/start system is dependent on the main battery, it is not tied to the Aux battery so if that system is never active then yes that is a sign of a weak main battery.
MBWorld Fanatic!
Joined: May 2015
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From: Miami, FL
2003 CL 600
lots of battery threads on here. Buy the best and most economical AGM that meets the criteria. No need for an OEM battery. Your ESS system is not working because your Main battery is going South. Replacing the main battery will get your ESS up and running again, whether you want it to work or not. Nothing to reset.
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MBWorld Fanatic!
Joined: May 2015
Posts: 4,037
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From: Miami, FL
2003 CL 600
but isn’t the main battery the only battery used to actual drive the starter during all starts including Eco? We have had several threads that continue to point to the main battery when Eco start/stop fails to engage ( not meeting all of the parameters). End users replace the main battery and things go back to normal. I’m so confused.
The small battery is used to maintain voltage when the car is cranking. If it doesn't pass the check, the car won't shut off. There are about 80 parameters that can disable an eco stop/start action. Either battery can be the cause.
