Starting System Woes - Drained Battery
Thread Starter
Member
Joined: May 2013
Posts: 77
Likes: 6
From: Easton, MD
2019 Maybach S560
Starting System Woes - Drained Battery
2010 S550 4matic
Been having a frequently recurring issue with a drained battery the last several months:
Seems the car battery does not have enough standing voltage to start the engine after sitting parked. Sometimes this occurs after a day or two, other times a couple of hours. I've had the alternator replaced 6-months ago, and the battery is 2-years old.
I've had the electrical and charging system tested. Both the battery and alternator are performing in spec. Also did a diagnostic on the electrical system for a parasitic drain, but within less than 30-minutes the system only has a 30-milliampere draw...if I lock the doors immediately after I exit it settles down in less than 30-minutes. Yet, this intermittent problem persists!
Before I pull out what little hair I have left, I thought I should post this problem in case it's either a known issue with a known remedy or if there was something unique to these models that I'm missing.
Thanks in advance for your relevant responses.
Been having a frequently recurring issue with a drained battery the last several months:
Seems the car battery does not have enough standing voltage to start the engine after sitting parked. Sometimes this occurs after a day or two, other times a couple of hours. I've had the alternator replaced 6-months ago, and the battery is 2-years old.
I've had the electrical and charging system tested. Both the battery and alternator are performing in spec. Also did a diagnostic on the electrical system for a parasitic drain, but within less than 30-minutes the system only has a 30-milliampere draw...if I lock the doors immediately after I exit it settles down in less than 30-minutes. Yet, this intermittent problem persists!
Before I pull out what little hair I have left, I thought I should post this problem in case it's either a known issue with a known remedy or if there was something unique to these models that I'm missing.
Thanks in advance for your relevant responses.
Member
Joined: Nov 2007
Posts: 204
Likes: 18
From: Connecticut
2018 E400 Coupe | 2021 Volvo XC40 Recharge
I remember reading about 2 possibilities. One where the key is stored too close to the location of the car and it wakes it and drains the battery. The other involved a Bluetooth connection that persists after you shutdown.
It could be an issue with a bad cell in the battery.
It could be an issue with a bad cell in the battery.
Junior Member
Joined: May 2006
Posts: 46
Likes: 0
From: Lewes DE LSD
"05 CLK320
I came across your question posted several years ago regarding your experience with your S Class battery being drained of its amperage. I am having a very similar experience with a W221, and the local dealer has not been able to identify a problem. Do you have any advice that you would care to share?
MBWorld Fanatic!
Joined: Oct 2010
Posts: 5,141
Likes: 1,293
From: Southern US
2010 E550, 273 Engine: 2012 S550, 278 Engine
2010 S550 4matic
Been having a frequently recurring issue with a drained battery the last several months:
Seems the car battery does not have enough standing voltage to start the engine after sitting parked. Sometimes this occurs after a day or two, other times a couple of hours. I've had the alternator replaced 6-months ago, and the battery is 2-years old.
I've had the electrical and charging system tested. Both the battery and alternator are performing in spec. Also did a diagnostic on the electrical system for a parasitic drain, but within less than 30-minutes the system only has a 30-milliampere draw...if I lock the doors immediately after I exit it settles down in less than 30-minutes. Yet, this intermittent problem persists!
Before I pull out what little hair I have left, I thought I should post this problem in case it's either a known issue with a known remedy or if there was something unique to these models that I'm missing.
Thanks in advance for your relevant responses.
Been having a frequently recurring issue with a drained battery the last several months:
Seems the car battery does not have enough standing voltage to start the engine after sitting parked. Sometimes this occurs after a day or two, other times a couple of hours. I've had the alternator replaced 6-months ago, and the battery is 2-years old.
I've had the electrical and charging system tested. Both the battery and alternator are performing in spec. Also did a diagnostic on the electrical system for a parasitic drain, but within less than 30-minutes the system only has a 30-milliampere draw...if I lock the doors immediately after I exit it settles down in less than 30-minutes. Yet, this intermittent problem persists!
Before I pull out what little hair I have left, I thought I should post this problem in case it's either a known issue with a known remedy or if there was something unique to these models that I'm missing.
Thanks in advance for your relevant responses.
When starter is going bad it does exactly what you say yours does. It can even crank the engine fine but pulls so much Amps the car cannot start.
