Dead Battery Already?
Thread Starter
Junior Member
Joined: Apr 2015
Posts: 69
Likes: 1
From: Bay Area, CA
C43
Dead Battery Already?
My battery died last weekend and left me stranded for 2 hours while I waited for MB roadside assistance to come out and change the battery. No lights were left on and the car is 18 months old with less than 16k miles. Has anyone else had a battery die this early? I thought this was extremely odd, given I live in Northern CA and the temps don't get very low. The roadside assistance tech thought it was odd and didn't have an explanation either. 
Super Member
Joined: Dec 2015
Posts: 505
Likes: 58
From: Gold Coast, Oz.
C300 S205 AMG, GLA 45 AMG
Excluding the obvious interior light left on....
any my accessories plugged; in dash camera that stays in after ignition off, Bluetooth OBD2 module that bleed current continuously??
If none of those it's possible to have a faulty battery..
If if it happens again you have a short somewhere... And that's down to merc to track down...
As as an aside I bought a Bosch smart charger to top up the batteries every few weeks to avoid issues.
docthe same in the motor bike and its batteries last over 5 years..
any my accessories plugged; in dash camera that stays in after ignition off, Bluetooth OBD2 module that bleed current continuously??
If none of those it's possible to have a faulty battery..
If if it happens again you have a short somewhere... And that's down to merc to track down...
As as an aside I bought a Bosch smart charger to top up the batteries every few weeks to avoid issues.
docthe same in the motor bike and its batteries last over 5 years..
Member
Joined: Apr 2010
Posts: 100
Likes: 3
From: SYDNEY, AUSTRALIA
C350e with Comand, Vision Package and seat package, 2017 Mini Cooper S 7
C350e
Still waiting for my C350e.
Out of interest, is there a separate battery for the engine since there is a "quite large" battery to run the car?
Out of interest, is there a separate battery for the engine since there is a "quite large" battery to run the car?
Senior Member
Joined: Jan 2016
Posts: 276
Likes: 21
C350e
It's positioned in the rear. Under the hood you will find a special contact that is connected to the 12V battery so you can use starter cables.
