Dead battery?
Thread Starter
Junior Member
Joined: Nov 2008
Posts: 23
Likes: 0
From: san jose, ca
2009 C350 P2 MM Pano
Dead battery?
My in-laws have an 08 c300 which isn't exactly new, but its less than a year old. They didn't drive it at all last week and the battery is completely drained.
Are there any basic things to check for? At least in my 09 c350, you can't leave the lights on accidentally since they will shut off automatically after a few minutes...
They took it to Beshoff of San Jose and some guy gave them crap about how all C-classes will go dead if not driven for 10 days. Then he was like, yeah, we charge up the batteries in the cars on the lots!
I don't quite buy that...
Are there any basic things to check for? At least in my 09 c350, you can't leave the lights on accidentally since they will shut off automatically after a few minutes...
They took it to Beshoff of San Jose and some guy gave them crap about how all C-classes will go dead if not driven for 10 days. Then he was like, yeah, we charge up the batteries in the cars on the lots!
I don't quite buy that...
Member
Joined: Jul 2008
Posts: 150
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From: GTA North
2011 BMW 335xi titanium silver.
Although a different car, my in-laws didn't drive their SL550 for months, and after they dropped by to see me, they couldn't get into the car with the keyless, had to use the little key. Once inside, luckily, the car started. Apparently, the car has 2 batteries, one for just starting the engine and the other for the electrical system (which was drained).
Not sure if the W204s have 2 batteries. There might be a short somewhere or perhaps a cabin light was left on?
Not sure if the W204s have 2 batteries. There might be a short somewhere or perhaps a cabin light was left on?
MBWorld Fanatic!
Joined: Feb 2004
Posts: 3,986
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From: SEATTLE WASHINGTON USA
'08 C300 Lux Barolo Red Beige Leather P2 MM 18" wheels '84 944
Dead and dead
My in-laws have an 08 c300 which isn't exactly new, but its less than a year old. They didn't drive it at all last week and the battery is completely drained.
Are there any basic things to check for? At least in my 09 c350, you can't leave the lights on accidentally since they will shut off automatically after a few minutes...
They took it to Beshoff of San Jose and some guy gave them crap about how all C-classes will go dead if not driven for 10 days. Then he was like, yeah, we charge up the batteries in the cars on the lots!
I don't quite buy that...
Are there any basic things to check for? At least in my 09 c350, you can't leave the lights on accidentally since they will shut off automatically after a few minutes...
They took it to Beshoff of San Jose and some guy gave them crap about how all C-classes will go dead if not driven for 10 days. Then he was like, yeah, we charge up the batteries in the cars on the lots!
I don't quite buy that...
The early W211's had an electronic problem that would deplete the battery overnight but that one was solved long ago.
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Joined: Oct 2008
Posts: 2,601
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From: Atlanta, GA
2008 C300 Sport 6 Speed Manual, 1953 Chevy Bel-Air, 2015 Audi allroad, 1963 Chevy Apache
Although we do have lots of devices to draw juice, none of them should draw down a battery within a week or month. Sounds simply like a bad battery or some electronic device/function is failing to disengage as designed.
Super Member
Joined: Jul 2002
Posts: 678
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From: Vancouver WA
'14 GLK250 Diesel
Like Derspeed, ours has often sat for well over two-three weeks with no problems.
Something is / was draining the system....too bad the dealer wasn't interested in finding out just what was the source.
Something is / was draining the system....too bad the dealer wasn't interested in finding out just what was the source.
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From: Europe
223.168 & 213.012 & 906.633 & 214.005
My in-laws have an 08 c300 which isn't exactly new, but its less than a year old. They didn't drive it at all last week and the battery is completely drained.
Are there any basic things to check for? At least in my 09 c350, you can't leave the lights on accidentally since they will shut off automatically after a few minutes...
They took it to Beshoff of San Jose and some guy gave them crap about how all C-classes will go dead if not driven for 10 days. Then he was like, yeah, we charge up the batteries in the cars on the lots!
I don't quite buy that...
Are there any basic things to check for? At least in my 09 c350, you can't leave the lights on accidentally since they will shut off automatically after a few minutes...
They took it to Beshoff of San Jose and some guy gave them crap about how all C-classes will go dead if not driven for 10 days. Then he was like, yeah, we charge up the batteries in the cars on the lots!
I don't quite buy that...
PS. only one battery on the W204.
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Thread Starter
Junior Member
Joined: Nov 2008
Posts: 23
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From: san jose, ca
2009 C350 P2 MM Pano
They do hear a constant ticking sound after they shut the car off. Not the typical metal expanding/contracting ticking, but more like a solenoid or something. I'll probably head to the dealer with them next time this happens...
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Joined: Jun 2008
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From: San Francisco, CA
2017 E300
on a related matter, one time, i walked into my garage after driving my lexus RX the previous night, and i could also hear like a ticking noise, like a bomb.
the battery was dead. so im guessing something similar here
the battery was dead. so im guessing something similar here
MBWorld Fanatic!
Joined: Feb 2004
Posts: 3,986
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From: SEATTLE WASHINGTON USA
'08 C300 Lux Barolo Red Beige Leather P2 MM 18" wheels '84 944
Dead
The car would not turn lights off automatically. The point is that lights may be left on because of the car being parked on the road to an unsafe place. The parking lights need to stay on as long as there is any juice in the battery.
PS. only one battery on the W204.
PS. only one battery on the W204.
There is a fault. If your "dealer" can't get interested then direct them to make an appointment with the area MB Rep for you.
Junior Member
Joined: Apr 2004
Posts: 70
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From: Sonoma County California
2018 E300 Luxury fully loaded
Our 10 month old C300 sat for 4 days and the battery was dead, registered 2.6 VDC on a meter. It has keyless go and all available options. After recharging the battery with a drive, the voltage was 12.9 VDC. I checked it after 10 hrs and the voltage was down to 11.9 VDC. I pulled out the keyless go button and am now using the key in the ignition switch. When I enter the car for the first time in the morning, the speedometer display turns on as soon as the door is opened with a message to not forget to take my key. This is not normal. Any idea what may have failed? Possibly the SAM?
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From: Europe
223.168 & 213.012 & 906.633 & 214.005
But it would be accidental to have lights on when they would turn off in the normal position.
Mavrogenis, if the power drain isn't from a near by KG key, I think you should first monitor the real power drain from the battery when the car is supposed to be in full sleep. If it has significant drain, pull fuses until you find the current reducing to normal level.
