12V Battery Problem?
Thread Starter
Member
Joined: Mar 2022
Posts: 125
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2024 Mercedes-Benz E350
12V Battery Problem?
Hello Everyone,
Anyone having issues with their 12V battery? I have a 24 E350 that I purchased in July, and it has been great. I remember when I first got the car, in the mercedesme app, the battery health obviously took time to calculate. 2 weeks ago I got a notification on the app that the 12 volt battery was very low. I started the car, drove for 15 minutes, and all has been fine since. yesterday it says it needs to calculate the health again. I assume this is normal?
All functions work fine, but it has been very cold here on the east coast. Just asking if anyone has experienced this?
Anyone having issues with their 12V battery? I have a 24 E350 that I purchased in July, and it has been great. I remember when I first got the car, in the mercedesme app, the battery health obviously took time to calculate. 2 weeks ago I got a notification on the app that the 12 volt battery was very low. I started the car, drove for 15 minutes, and all has been fine since. yesterday it says it needs to calculate the health again. I assume this is normal?
All functions work fine, but it has been very cold here on the east coast. Just asking if anyone has experienced this?
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Joined: Apr 2019
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
HEALTHY BATTERY TIPS
Hello Everyone,
Anyone having issues with their 12V battery? I have a 24 E350 that I purchased in July, and it has been great. I remember when I first got the car, in the mercedesme app, the battery health obviously took time to calculate. 2 weeks ago I got a notification on the app that the 12 volt battery was very low. I started the car, drove for 15 minutes, and all has been fine since. yesterday it says it needs to calculate the health again. I assume this is normal?
All functions work fine, but it has been very cold here on the east coast. Just asking if anyone has experienced this?
Anyone having issues with their 12V battery? I have a 24 E350 that I purchased in July, and it has been great. I remember when I first got the car, in the mercedesme app, the battery health obviously took time to calculate. 2 weeks ago I got a notification on the app that the 12 volt battery was very low. I started the car, drove for 15 minutes, and all has been fine since. yesterday it says it needs to calculate the health again. I assume this is normal?
All functions work fine, but it has been very cold here on the east coast. Just asking if anyone has experienced this?
> There are multiple ways your starter battery will get drained:
- Drained by not driving at least every 3 weeks
- Drained by sleepless slow Body modules
- Drained by driving with ECU under 11V
> To never deal with bad battery issues, the best eay is to use a Mercedes branded battery tender made by CTEK.
It will maintain a perfect charge to keep the battery endlessly fresh for 10 years.
> WHAT NOT TO DO is jump start the car and drive with extremely high charge current (greater than 30Amp!) - Recharge first!!
> MONITOR STATUS WHILE DRIVING:
Enter the Instrument cluster "shop menu" to display live battery vitals. You want to see low currents below 10Amps.
Last edited by CaliBenzDriver; Jan 26, 2025 at 01:50 PM.
Member
Joined: May 2024
Posts: 85
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S-class, E450 W214, E350 W214
My son's 2024 E350 recently also had a "very low charge" alert message in the Mercedes Me app (the car was not driven only for 2 days). However, he was able to enter and start the car without any issues. After driving the car for a while, the warning message in the Mercedes Me app went away on its own. Since there was no warning messages on the dashboard in the car, we chalked it up as a glitch and false alarm in the Mercedes App.
Thread Starter
Member
Joined: Mar 2022
Posts: 125
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2024 Mercedes-Benz E350
My son's 2024 E350 recently also had a "very low charge" alert message in the Mercedes Me app (the car was not driven only for 2 days). However, he was able to enter and start the car without any issues. After driving the car for a while, the warning message in the Mercedes Me app went away on its own. Since there was no warning messages on the dashboard in the car, we chalked it up as a glitch and false alarm in the Mercedes App.
Senior Member
Joined: Jun 2024
Posts: 481
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From: DFW Texas
GL450, E450, Porsche 718 GTS
I suspect the low battery issues in these cars are the main culprit in the frequent screen crashes some people are having.
Nothing to back that up but just my suspicion.
Nothing to back that up but just my suspicion.
Member
Joined: Sep 2024
Posts: 111
Likes: 17
W214 E350
It has been a common occurrence for me that if your MB sits for more than 4-5 days, the low-status charge alert always comes up on the Mercedes app. I had my E350 in the shop for PPF and tints (4 days total) and had the warning come up. I also used to get this warning for my EQS while the car was in service waiting for parts to arrive (7-9 days in).
Thread Starter
Member
Joined: Mar 2022
Posts: 125
Likes: 11
2024 Mercedes-Benz E350
It has been a common occurrence for me that if your MB sits for more than 4-5 days, the low-status charge alert always comes up on the Mercedes app. I had my E350 in the shop for PPF and tints (4 days total) and had the warning come up. I also used to get this warning for my EQS while the car was in service waiting for parts to arrive (7-9 days in).
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From: California
E53 (2025), C300 4MATIC (2014)
While it doesn't explain all scenarios, people have reported that the Digital Key (in your phone/watch) can keep your car "awake" as long as the device with that digital key is still in Bluetooth range (~30 feet). One solution was deleting digital keys and just using OEM key. Not suggesting this is the most likely issue here, but worth ruling out.
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Out Of Control!!
Joined: Apr 2019
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
5 days: that's "DRAINED BY PARKING"
Using an automated battery tender is the single best way to prevent battery damage while parked.
Repairing solderless modules is against policies limited to frequent battery warranty.
Last edited by CaliBenzDriver; Jan 26, 2025 at 11:53 PM.
Junior Member
Joined: Aug 2018
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E Class 220 d
Since deleting my digital key from my phone I have had no battery or screen issues….my phone was within 30 feet of the car overnight and I am pretty sure they were communicating all night while I slept.
Out Of Control!!
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
The best practice is to LOCK DOORS: it speeds up security pooling that drains the battery when door modules are unstable.
> Meaning car enters deeper sleep while LOCKED.
Sanity is restored.
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Joined: Dec 2023
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2024 GLC300 2025 E450
isn’t the anti-thief system activated when the car is locked?
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
Anti-theft security is not a single module, it's distributed function.
When doors are locked more body modules are allowed to power down.
This result in significant energy savings measured in days.
Bottom line is always lock even at home.
When doors are locked more body modules are allowed to power down.
This result in significant energy savings measured in days.
Bottom line is always lock even at home.
Senior Member
Joined: Jun 2024
Posts: 481
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From: DFW Texas
GL450, E450, Porsche 718 GTS
That’s what I do. Even though I park in my garage, I always lock the car just to be sure everything shuts down and the app doesn’t bug me saying the car is unlocked. I haven’t had a battery problem or a screen crash yet. (Knock on wood).
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From: Tennessee
W214 E450
I do the same. Locked in the detached garage. Never had a battery issue even when not driving for over a week.
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GLE 580
Last edited by wildta; Jan 29, 2025 at 12:50 PM.
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.
If I'm not in the car it is locked even if I'm washing it in my driveway. I've had an occurance while I was bent down cleaning a wheel, someone snuck up on the other side and stole a folio that was on the seat.
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GLE 580
That's horrible. I've seen video clips of something similar happening at gas stations.
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Joined: Apr 2014
Posts: 25
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From: Ponte Vedra, Florida
2026 GLC300 Coupe Verde Silver
Welcome to the joy of owning the finest driving machine. Advanced electronic require healthy batteries.
> There are multiple ways your starter battery will get drained:
> To never deal with bad battery issues, the best eay is to use a Mercedes branded battery tender made by CTEK.
It will maintain a perfect charge to keep the battery endlessly fresh for 10 years.
> WHAT NOT TO DO is jump start the car and drive with extremely high charge current (greater than 30Amp!) - Recharge first!!
> MONITOR STATUS WHILE DRIVING:
Enter the Instrument cluster "shop menu" to display live battery vitals. You want to see low currents below 10Amps.
> There are multiple ways your starter battery will get drained:
- Drained by not driving at least every 3 weeks
- Drained by sleepless slow Body modules
- Drained by driving with ECU under 11V
> To never deal with bad battery issues, the best eay is to use a Mercedes branded battery tender made by CTEK.
It will maintain a perfect charge to keep the battery endlessly fresh for 10 years.
> WHAT NOT TO DO is jump start the car and drive with extremely high charge current (greater than 30Amp!) - Recharge first!!
> MONITOR STATUS WHILE DRIVING:
Enter the Instrument cluster "shop menu" to display live battery vitals. You want to see low currents below 10Amps.
Out Of Control!!
Joined: Apr 2019
Posts: 11,923
Likes: 6,776
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
locking saves battery
There is a 4th way the starter battery can get drained; If you don't lock your car when in your home garage or outside, the battery is drained due to various electrical components that remain on.
This was the response I received from the Director of Service of my local dealer. Ever since I began locking my E Class when in my garage, I've not had the problem.
This was the response I received from the Director of Service of my local dealer. Ever since I began locking my E Class when in my garage, I've not had the problem.
lock the car when not used to prevent fast battery drain.
This was covered as #2: "slow sleepless modules"
Junior Member
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E Class 220 d
Just to add my car was locked but was not in a garage it was on my drive outside but my phone which was in my bedroom kept waking it up and draining battery, the handles would pop out and the USB would light up showing some modules were awake and drawing power
Out Of Control!!
Joined: Apr 2019
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
is your phone setup to act as a "key" authenticator?
Out Of Control!!
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
functional workaround 👍
new technology just works.
Eventually they'll make software stacks cooperate well.
Until then you can choose your preference: On/Off.
Eventually they'll make software stacks cooperate well.
Until then you can choose your preference: On/Off.
