Battery drain
Thread Starter
Junior Member
Joined: Apr 2017
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E class w213
Battery drain
I have been having problems with my E class.
for the past month there has been a parasitic drain it has been in and out of the dealership but it still keeps draining and its unable to start.
Its temperamental and happens at random times. I have tried checking how much power fuses are drawing and all of them seem okay.
has anyone got any suggestions?
for the past month there has been a parasitic drain it has been in and out of the dealership but it still keeps draining and its unable to start.
Its temperamental and happens at random times. I have tried checking how much power fuses are drawing and all of them seem okay.
has anyone got any suggestions?
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Joined: May 2018
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From: Long Island, NY
2019 E 450, 2016 E350 4matic (retired), 2018 Ford Edge Sport, 2008 Porsche Boxster
I have been having problems with my E class.
for the past month there has been a parasitic drain it has been in and out of the dealership but it still keeps draining and its unable to start.
Its temperamental and happens at random times. I have tried checking how much power fuses are drawing and all of them seem okay.
has anyone got any suggestions?
for the past month there has been a parasitic drain it has been in and out of the dealership but it still keeps draining and its unable to start.
Its temperamental and happens at random times. I have tried checking how much power fuses are drawing and all of them seem okay.
has anyone got any suggestions?
Second: When you park your car make sure the doors are locked. This cuts down on the drain.
Third: If the battery is good have you considered a trickle charge? There are several threads on trickle charges. The consensus and what I use are chargers made by CTEK:
see: https://smartercharger.com/
Thread Starter
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Joined: Apr 2017
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E class w213
Thanks for your reply
Mercedes replaced the battery about 3 weeks ago.
All doors are locked
I will take a look at the trickle charger although the car was pulling between 8-10amps when it was completely off so it was just draining the battery in 4 hours.
Mercedes replaced the battery about 3 weeks ago.
All doors are locked
I will take a look at the trickle charger although the car was pulling between 8-10amps when it was completely off so it was just draining the battery in 4 hours.
MBWorld Fanatic!
Joined: May 2018
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From: Long Island, NY
2019 E 450, 2016 E350 4matic (retired), 2018 Ford Edge Sport, 2008 Porsche Boxster
I would suggest you take it back to the dealer: there is something wrong. If it is still under warranty have them fix it.
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Joined: May 2018
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From: Long Island, NY
2019 E 450, 2016 E350 4matic (retired), 2018 Ford Edge Sport, 2008 Porsche Boxster
Can you duplicate for the dealer that it is pulling 8-10 Amps? If you can, then it is up to the dealer to fix that.
Thread Starter
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E class w213
Well the dealer seen it pull 8-10Amps. I picked the car up "fixed" and then 4 days later it was doing it again.
It just seems to be random times so im wondering if its a control module that seems to be pulling power at random times
It just seems to be random times so im wondering if its a control module that seems to be pulling power at random times
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From: Eastern Maryland
ES350 E300 GLE350 GMC3500 Duramax
That is a very high amp draw. My E drain is much less and my Granite Digital battery tender at 25 watts is way more to keep the AGM battery correct Oh only use a trickle charger when you absolutely need it as those are not designed for full time application with a AGM battery
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From: Austin TX Area
2020 E450 Wagon
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From: Long Island, NY
2019 E 450, 2016 E350 4matic (retired), 2018 Ford Edge Sport, 2008 Porsche Boxster
I keep my car in the garage and drive it almost daily so like you, I do not have issues with the battery.
Check other threads and they describe in greater detail the advantages to battery drain by locking the vehicle.
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Joined: May 2015
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From: Austin TX Area
2020 E450 Wagon
Unlike you, I don't use my E450 wagon daily, only a few times per week. I have a two year old VW Golf wagon that I use as daily driver and to haul my two Greyhounds in to various parks daily, I just purchased a CTEK MXS 5.0 charger to prevent low battery issues.
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From: NJ
E300-4matic
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Joined: May 2015
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From: Austin TX Area
2020 E450 Wagon
My 2019 E300’s battery won’t go more than 3 days before the battery dies so I purchased a CTEK battery charger which keeps the battery topped up and that’s still a pain because you can’t remotely start your car until I disconnect the battery charger. It gets brutally cold where I live here in the Winter so just going out to disconnect the battery charger is a chore. But the normal drain on the E300-E350 battery is very high. I have no idea why.
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From: NJ
E300-4matic
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Posts: 342
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From: NJ
E300-4matic
Enable Standby mode
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From: Austin TX Area
2020 E450 Wagon
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From: NJ
E300-4matic
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535XIT, E63S
First how old is your battery?
Second: When you park your car make sure the doors are locked. This cuts down on the drain.
Third: If the battery is good have you considered a trickle charge? There are several threads on trickle charges. The consensus and what I use are chargers made by CTEK:
see: https://smartercharger.com/
Second: When you park your car make sure the doors are locked. This cuts down on the drain.
Third: If the battery is good have you considered a trickle charge? There are several threads on trickle charges. The consensus and what I use are chargers made by CTEK:
see: https://smartercharger.com/
Super Member
Joined: Mar 2013
Posts: 679
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From: SWFL
2023 BMW M340i, 2025 MB CLE53 AMG
Replaced battery on 2018 E400
Just had dealer replace battery under warranty. Auto Stop/Start was not working. Funny that they tested the battery when I had the car in for something else last week and they said it was fine.
Obviously, something changed. Happy that I saved myself a couple of hundred dollars.
Obviously, something changed. Happy that I saved myself a couple of hundred dollars.
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535XIT, E63S
I don't drive my AMG when salt is on the roads and therefore it sits January & February. I just put the car on charge for a couple days and then remove it so the battery does not over charge, yes modern chargers will float but really see the point .
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From: Illinois
2021 c300 Cab. Arrived 7/28/21 . 24 GLE 450e.
Keep in mind that standby mode turns off the alarm.
I’m thinking of buying an MB. Looking at the forums, I’m surprised how many times I’ve seen “I have a problem and dealer can’t fix”.
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From: Long Island, NY
2019 E 450, 2016 E350 4matic (retired), 2018 Ford Edge Sport, 2008 Porsche Boxster
I don’t believe for a minute that there is substantially more power drain when the car is unlocked. Yes, a couple systems may shut down quicker when locked. But not enough to make a difference. As a matter of fact, when locked the alarm is on. That uses power. I don’t have an MB yet. But I never have locked the car in the garage, and I keep a dash cam plugged in all the time in my BMW. Which stays powered on for several minutes. Never had a problem.
Keep in mind that standby mode turns off the alarm.
I’m thinking of buying an MB. Looking at the forums, I’m surprised how many times I’ve seen “I have a problem and dealer can’t fix”.
Keep in mind that standby mode turns off the alarm.
I’m thinking of buying an MB. Looking at the forums, I’m surprised how many times I’ve seen “I have a problem and dealer can’t fix”.
As to problems: Very few of us post that we "have no problems": what you get on a forum are people seeking help with their cars.
The one exception: poor ride: but almost 100% of those with a complaint do not have standard wheels. I have standard wheels with RF and I have no problems with the ride.
