C238 Battery
Thread Starter
Senior Member
Joined: Aug 2003
Posts: 497
Likes: 3
From: Ontario
2019 E450 Coupe 4Matic; 2018 Audi Q5; 2019 Toyota Corolla Hatchback
C238 Battery
Mine is a 2019 C238.
When should we replace the car battery? Do we need to do the battery registration?
If so, any recommended OBD reader or scanner to do this?
Beside, where is the auxiliary batter located?
My car has no battery problem at this moment but I just want to know the battery replacement just in case.
Thanks.
When should we replace the car battery? Do we need to do the battery registration?
If so, any recommended OBD reader or scanner to do this?
Beside, where is the auxiliary batter located?
My car has no battery problem at this moment but I just want to know the battery replacement just in case.
Thanks.
Thread Starter
Senior Member
Joined: Aug 2003
Posts: 497
Likes: 3
From: Ontario
2019 E450 Coupe 4Matic; 2018 Audi Q5; 2019 Toyota Corolla Hatchback
Thanks.
As I know, C205 has the auxiliary battery under the dashboard (near the cabin filter area).
If C238 (2019 model) does not have it, it will be great.
As I know, C205 has the auxiliary battery under the dashboard (near the cabin filter area).
If C238 (2019 model) does not have it, it will be great.
MBWorld Fanatic!
Joined: Nov 2015
Posts: 1,691
Likes: 824
From: Newcastle, WA
2019 S63 4Matic+, 2018 E400 Cabrio, wardens car.
The 2018 E400 can have one of three different sized batteries, You need to physically measure it to be sure you are getting the correct one for your car. I just put the biggest one in, a group H8 (49) AGM as that is what they use in the E43. I think they all come with a 200A alternator so not sure what the differences are but probably the level of electronics in each version.
Junior Member
Joined: Jul 2010
Posts: 45
Likes: 14
From: The DMV
2019 E450 Coupe; 2019 E300 Sedan, 2019 Volvo XC90
(Electronically) seamless process for replacing C238 and W213 batteries?
Do you have to do anything special to replace the battery (other than unscrew, remove and replace)? That is, do you lose settings or does anything need to be recoded? The OEM batteries in my 2019 E450 coupe and my wife's 2019 E300 sedan (both manufactured in late 2018) routinely read Partially Charged in the Mercedes Me Connect app. In fact, both have read Critical on multiple occasions and I've only seen (fully) Charged once or twice on either car in 12/17 months of ownership (both were CPO).
As a result, I assume it's time to replace both batteries and from a physical standpoint, would rather do it myself. Don't want to introduce any electronic gremlins, however, so any advice/personal experiences would be greatly appreciated!
As a result, I assume it's time to replace both batteries and from a physical standpoint, would rather do it myself. Don't want to introduce any electronic gremlins, however, so any advice/personal experiences would be greatly appreciated!
Last edited by SidE2; Mar 31, 2023 at 08:59 AM. Reason: Add title correct typos
MBWorld Fanatic!
Joined: Nov 2015
Posts: 1,691
Likes: 824
From: Newcastle, WA
2019 S63 4Matic+, 2018 E400 Cabrio, wardens car.
Nothing special, easier to do with one person helping you to hold all the cables when you drop the new battery in the hole that it sits in. Other than that it is pretty much disconnect the old one and install the new one in reverse order.
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Thread Starter
Senior Member
Joined: Aug 2003
Posts: 497
Likes: 3
From: Ontario
2019 E450 Coupe 4Matic; 2018 Audi Q5; 2019 Toyota Corolla Hatchback
Do you have to do anything special to replace the battery (other than unscrew, remove and replace)? That is, do you lose settings or does anything need to be recoded? The OEM batteries in my 2019 E450 coupe and my wife's 2019 E300 sedan (both manufactured in late 2018) routinely read Partially Charged in the Mercedes Me Connect app. In fact, both have read Critical on multiple occasions and I've only seen (fully) Charged once or twice on either car in 12/17 months of ownership (both were CPO).
As a result, I assume it's time to replace both batteries and from a physical standpoint, would rather do it myself. Don't want to introduce any electronic gremlins, however, so any advice/personal experiences would be greatly appreciated!
As a result, I assume it's time to replace both batteries and from a physical standpoint, would rather do it myself. Don't want to introduce any electronic gremlins, however, so any advice/personal experiences would be greatly appreciated!
I have the 2019 E450 as well and I am still having the OEM battery. The only concern is whether the battery needs to be registered. I think there are some OBD reader / scanner that you can purchase from Amazon and able to do the battery registration (not sure which brand and model).
MBWorld God!
Joined: Dec 2019
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When my car has not driven almost a week, the Me Connect app. showed the "Partially Charged" message as well. I connected the battery tender to the battery poles under the hood and charged the battery. Once it is fully charged, the Me Connect app. showed "Fully Charged".
I have the 2019 E450 as well and I am still having the OEM battery. The only concern is whether the battery needs to be registered. I think there are some OBD reader / scanner that you can purchase from Amazon and able to do the battery registration (not sure which brand and model).
I have the 2019 E450 as well and I am still having the OEM battery. The only concern is whether the battery needs to be registered. I think there are some OBD reader / scanner that you can purchase from Amazon and able to do the battery registration (not sure which brand and model).
Thread Starter
Senior Member
Joined: Aug 2003
Posts: 497
Likes: 3
From: Ontario
2019 E450 Coupe 4Matic; 2018 Audi Q5; 2019 Toyota Corolla Hatchback
Newbie
Joined: Jun 2006
Posts: 10
Likes: 4
C238
Having recently purchased a second hand C238, the car texted me "Critical battery level" whenever I sat in the car with something turned on. The "ME" app always reported back "Partially Charged".
With everything turned off the battery voltage was at 12.4V, sometimes 12.3. As a result of this, the boot never responded to keyless opening. Nor did the "ECO" drive activate.
After filing a warranty claim with the dealer, the battery was replaced. Now, ME always reports "Charged". Keyless boot works and (unfortunately) the ECO-drive as well.
The battery voltage is 13V with everything turned off. My opinion is that one cell was bad since the car always started w/o problem and the battery test returned 740A start
capacity (spec = 800A).
I had the dealer replace the battery. Otherwise, and that is if no Xentry interaction is involved, I always follow the procedure
below as recommended by a friend and long time mercedes mechanic:
1. Open the hood.
2. Take the driver side window down.
3. Turn off everything.
4. Lock the car
5. Remove any keyless key well away from the car.
6. Wait about 20 minutes for the car to go into sleep-mode.
7. Replace the battery.
By doing this, there will be no memory lost (window/panorama roof) etc.
If the system (temporary) looses any code sequence, it is always possible to open the door manually from the outside
and the car can be started using the transponder in the key.
With everything turned off the battery voltage was at 12.4V, sometimes 12.3. As a result of this, the boot never responded to keyless opening. Nor did the "ECO" drive activate.
After filing a warranty claim with the dealer, the battery was replaced. Now, ME always reports "Charged". Keyless boot works and (unfortunately) the ECO-drive as well.
The battery voltage is 13V with everything turned off. My opinion is that one cell was bad since the car always started w/o problem and the battery test returned 740A start
capacity (spec = 800A).
I had the dealer replace the battery. Otherwise, and that is if no Xentry interaction is involved, I always follow the procedure
below as recommended by a friend and long time mercedes mechanic:
1. Open the hood.
2. Take the driver side window down.
3. Turn off everything.
4. Lock the car
5. Remove any keyless key well away from the car.
6. Wait about 20 minutes for the car to go into sleep-mode.
7. Replace the battery.
By doing this, there will be no memory lost (window/panorama roof) etc.
If the system (temporary) looses any code sequence, it is always possible to open the door manually from the outside
and the car can be started using the transponder in the key.
MBWorld God!
Joined: Dec 2019
Posts: 32,375
Likes: 6,324
Having recently purchased a second hand C238, the car texted me "Critical battery level" whenever I sat in the car with something turned on. The "ME" app always reported back "Partially Charged".
With everything turned off the battery voltage was at 12.4V, sometimes 12.3. As a result of this, the boot never responded to keyless opening. Nor did the "ECO" drive activate.
After filing a warranty claim with the dealer, the battery was replaced. Now, ME always reports "Charged". Keyless boot works and (unfortunately) the ECO-drive as well.
The battery voltage is 13V with everything turned off. My opinion is that one cell was bad since the car always started w/o problem and the battery test returned 740A start
capacity (spec = 800A).
I had the dealer replace the battery. Otherwise, and that is if no Xentry interaction is involved, I always follow the procedure
below as recommended by a friend and long time mercedes mechanic:
1. Open the hood.
2. Take the driver side window down.
3. Turn off everything.
4. Lock the car
5. Remove any keyless key well away from the car.
6. Wait about 20 minutes for the car to go into sleep-mode.
7. Replace the battery.
By doing this, there will be no memory lost (window/panorama roof) etc.
If the system (temporary) looses any code sequence, it is always possible to open the door manually from the outside
and the car can be started using the transponder in the key.
With everything turned off the battery voltage was at 12.4V, sometimes 12.3. As a result of this, the boot never responded to keyless opening. Nor did the "ECO" drive activate.
After filing a warranty claim with the dealer, the battery was replaced. Now, ME always reports "Charged". Keyless boot works and (unfortunately) the ECO-drive as well.
The battery voltage is 13V with everything turned off. My opinion is that one cell was bad since the car always started w/o problem and the battery test returned 740A start
capacity (spec = 800A).
I had the dealer replace the battery. Otherwise, and that is if no Xentry interaction is involved, I always follow the procedure
below as recommended by a friend and long time mercedes mechanic:
1. Open the hood.
2. Take the driver side window down.
3. Turn off everything.
4. Lock the car
5. Remove any keyless key well away from the car.
6. Wait about 20 minutes for the car to go into sleep-mode.
7. Replace the battery.
By doing this, there will be no memory lost (window/panorama roof) etc.
If the system (temporary) looses any code sequence, it is always possible to open the door manually from the outside
and the car can be started using the transponder in the key.
MBWorld God!
Joined: Dec 2019
Posts: 32,375
Likes: 6,324
To add to my post, it also has to do with the vehicle charging the old battery at a higher rate and higher voltage to help maintain the functions of the vehicle which obviously isn't needed on the new battery and might degrade the new battery faster because of that.
Junior Member
Joined: Jul 2010
Posts: 45
Likes: 14
From: The DMV
2019 E450 Coupe; 2019 E300 Sedan, 2019 Volvo XC90
Well, just over a year after my last post on this topic, both my wife's E300 sedan and my E450 coupe started sending "battery critical" messages via email and occasionally "discharged" in Mercedes Me Connect. Because my wife doesn't drive her car as much as i drive mine, I visited my local Costco and handed over $169.99 for a size H7 AGM battery for her car.
For the two or three minutes it took for me to install her battery I connected our Noco Genius battery tender to her positive and negative terminals only to realize it wasn't providing power. Fortunately, once I replaced the battery, all settings - down to navigation memory and radio settings - remained intact. Because our cars were produced two weeks apart, I returned to Costco and bought my battery. This time I bypassed the Noco. Although my car was without power for about 20 minutes while I fiddled with a battery holddown nut that kept sliding out of position once again, everything worked per normal.
Definitely happy to see that the battery replacement process was "plug and play" for both cars.
For the two or three minutes it took for me to install her battery I connected our Noco Genius battery tender to her positive and negative terminals only to realize it wasn't providing power. Fortunately, once I replaced the battery, all settings - down to navigation memory and radio settings - remained intact. Because our cars were produced two weeks apart, I returned to Costco and bought my battery. This time I bypassed the Noco. Although my car was without power for about 20 minutes while I fiddled with a battery holddown nut that kept sliding out of position once again, everything worked per normal.
Definitely happy to see that the battery replacement process was "plug and play" for both cars.
Last edited by SidE2; Apr 10, 2024 at 09:26 PM.
Thread Starter
Senior Member
Joined: Aug 2003
Posts: 497
Likes: 3
From: Ontario
2019 E450 Coupe 4Matic; 2018 Audi Q5; 2019 Toyota Corolla Hatchback
Junior Member
Joined: Jul 2010
Posts: 45
Likes: 14
From: The DMV
2019 E450 Coupe; 2019 E300 Sedan, 2019 Volvo XC90
Understand all three will work, although with the robust cables and connections M-B builds in, wedging the H7 in there wasn't the easiest thing to do.
Newbie
Joined: Aug 2024
Posts: 1
Likes: 0
E400 A238
The 2018 E400 can have one of three different sized batteries, You need to physically measure it to be sure you are getting the correct one for your car. I just put the biggest one in, a group H8 (49) AGM as that is what they use in the E43. I think they all come with a 200A alternator so not sure what the differences are but probably the level of electronics in each version.
would you happen to know where a 2018 E400 aux battery lives??? ours needs replaced and for the life of me and despite my best black belt search skills… I can’t find the location anywhere!
Thread Starter
Senior Member
Joined: Aug 2003
Posts: 497
Likes: 3
From: Ontario
2019 E450 Coupe 4Matic; 2018 Audi Q5; 2019 Toyota Corolla Hatchback
I asked this question in the earlier thread. There was NO aux battery in the C238 (at least to my 2019).
MBWorld God!
Joined: Dec 2019
Posts: 32,375
Likes: 6,324
Thread Starter
Senior Member
Joined: Aug 2003
Posts: 497
Likes: 3
From: Ontario
2019 E450 Coupe 4Matic; 2018 Audi Q5; 2019 Toyota Corolla Hatchback
I went to the dealership to replace the main battery. I checked with the parts department and the guy confirmed with me showing the diagram that there was an Auxiliary battery near the cabin filter behind the glove box.
Maybe the Canadian version is different than the US.
Maybe the Canadian version is different than the US.
MBWorld God!
Joined: Dec 2019
Posts: 32,375
Likes: 6,324
I went to the dealership to replace the main battery. I checked with the parts department and the guy confirmed with me showing the diagram that there was an Auxiliary battery near the cabin filter behind the glove box.
Maybe the Canadian version is different than the US.
Maybe the Canadian version is different than the US.
