Battery charging
Senior Member
Joined: May 2019
Posts: 384
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From: SW Desert USA
2014 Jag F-Type vert, 2004 Volvo V70R
Well I joined the club this morning. I have been getting a message "battery partial charge" on MB Connect for some time. This AM the cargo door would not release by its handle and there was a warning on the dash in yellow "12 volt battery" so I got out the Ctek battery manager I keep for when the other machine goes into seasonal storage. The US manual (p.385) has a good diagram, but the written instructions are incomplete. It only mentions the positive connection.
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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
see post #2: next to the red (+) terminal there is an exposed bolt which is the negative terminal
Senior Member
Joined: May 2019
Posts: 384
Likes: 89
From: SW Desert USA
2014 Jag F-Type vert, 2004 Volvo V70R
Right you are. There are three bolts that hold a frame member and a brass "terminal" for the negative lead It is clear on the diagram in the manual even though there is no written description. Nice of MB to color code things.
Thread Starter
Senior Member
Joined: Jan 2015
Posts: 446
Likes: 56
EQE 500 4MATIC replacing EQC 4matic AMG line P
Thanks to all who answered. We had 8 weeks hard lockdown and now can go out but only in a max 100km radius from home. The car sat at least 4 times for 6 continuous days after only a 10km run. It would show 11.7 on the output menu in the vehicle section of command. I used my charger for usually 5 or 6 hrs and it would get to 11.9 or 12 volts and after a few days it would drop back a couple of points. She always started as normal though really fast as ever and she is diesel. The car did sink slightly too on the air suspension.
I am cautious about leaving her hooked up as a bad storm blew my better charger so that is totally destroyed (the one I use seems to have lost its winter function). Seems they are rather vunerable things.
eco stop start was working but of late seems not too. I had the aux battery in my c class replaced and fear the same will happen again. It does seem to need regular charging.... it is not an actual battery by the way but some sort of electronic system with capacitors the c class thread has good discussion about it.
I have had a few longer runs so have got a bit laissez faire about charging the battery but wonder what might be the effect long term on battery life but not much I can do about it. Still waiting on changing the winter tyres and the seatbelt recall🙄
I am cautious about leaving her hooked up as a bad storm blew my better charger so that is totally destroyed (the one I use seems to have lost its winter function). Seems they are rather vunerable things.
eco stop start was working but of late seems not too. I had the aux battery in my c class replaced and fear the same will happen again. It does seem to need regular charging.... it is not an actual battery by the way but some sort of electronic system with capacitors the c class thread has good discussion about it.
I have had a few longer runs so have got a bit laissez faire about charging the battery but wonder what might be the effect long term on battery life but not much I can do about it. Still waiting on changing the winter tyres and the seatbelt recall🙄
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