Battery completely dead.

Dean Fletcher

Senior Member
Joined
Mar 24, 2018
Messages
4,255
Reaction score
3,268
Location
Penrith, Cumbria
Your Mercedes
Mercedes E400
So I was going out to sort the battery problem this moring and tried to open the car at its completely dead even the fob won't open it. So I tried putting the little key in and it goes fine in but won't turn?? I have tried both keys?? Any ideas? Do I need to force it a little?
 

Blobcat

Moderator
Joined
Feb 8, 2006
Messages
38,986
Reaction score
27,747
Location
Grange Moor
Your Mercedes
R171 SLK280, Smart R451, Land Rover 110 County SW, 997 C2S, R1250 GSA TE 40th, CBR600FP
Needs to turn 90’ - the last little bit of turn is what operates the lock.
Lube and work it...
 
OP
Dean Fletcher

Dean Fletcher

Senior Member
Joined
Mar 24, 2018
Messages
4,255
Reaction score
3,268
Location
Penrith, Cumbria
Your Mercedes
Mercedes E400
  • Thread Starter
  • Thread starter
  • #3
Cheers BC it just popped into my head and sorted it. ****** thing thanks
 
OP
Dean Fletcher

Dean Fletcher

Senior Member
Joined
Mar 24, 2018
Messages
4,255
Reaction score
3,268
Location
Penrith, Cumbria
Your Mercedes
Mercedes E400
  • Thread Starter
  • Thread starter
  • #4
Next thing when I plug in the charger the ****** alarm keeps going off hahaha
 

Blobcat

Moderator
Joined
Feb 8, 2006
Messages
38,986
Reaction score
27,747
Location
Grange Moor
Your Mercedes
R171 SLK280, Smart R451, Land Rover 110 County SW, 997 C2S, R1250 GSA TE 40th, CBR600FP
Next thing when I plug in the charger the ****** alarm keeps going off hahaha
It will, if you open the door with the metal key the alarm will sound. You need to put the key in the ignition and turn to pos 1 to stop it.
 

Wighty

Senior Member
Joined
Aug 4, 2016
Messages
13,480
Reaction score
12,544
Location
Sunny Essex
Your Mercedes
W211/E320cdi/2009 and CLK200k 2009
It will, if you open the door with the metal key the alarm will sound. You need to put the key in the ignition and turn to pos 1 to stop it.
You better go round and sort it for him , he can bake something whilst you work :D
 
OP
Dean Fletcher

Dean Fletcher

Senior Member
Joined
Mar 24, 2018
Messages
4,255
Reaction score
3,268
Location
Penrith, Cumbria
Your Mercedes
Mercedes E400
  • Thread Starter
  • Thread starter
  • #7
You better go round and sort it for him , he can bake something whilst you work :D
Haha the issue was the battery had no life at all so putting the key in the ignition didn't help as nothing showed up. Everytime I presses on, on the charger the ****** thing went off. So I resorted to good old fashion jump start. Had to leave them together for 15 minutes before it would start. Soooo I have been a got a new battery.
 

Blobcat

Moderator
Joined
Feb 8, 2006
Messages
38,986
Reaction score
27,747
Location
Grange Moor
Your Mercedes
R171 SLK280, Smart R451, Land Rover 110 County SW, 997 C2S, R1250 GSA TE 40th, CBR600FP
You better go round and sort it for him , he can bake something whilst you work :D
Lockdown still in effect (unless I missed a memo...)o_O
 

Blobcat

Moderator
Joined
Feb 8, 2006
Messages
38,986
Reaction score
27,747
Location
Grange Moor
Your Mercedes
R171 SLK280, Smart R451, Land Rover 110 County SW, 997 C2S, R1250 GSA TE 40th, CBR600FP
Haha the issue was the battery had no life at all so putting the key in the ignition didn't help as nothing showed up. Everytime I presses on, on the charger the ****** thing went off. So I resorted to good old fashion jump start. Had to leave them together for 15 minutes before it would start. Soooo I have been a got a new battery.
I know it’s a bit of a PITA but get the caps off of the individual battery cells. I expect there will be no electrolyte showing at all.
To get the caps off cut the sticker around the circular tops then with a screwdriver (and hammer...) knock them anti-clockwise until you can unscrew them.
Add some deionised water and put it back on charge. I expect it will spring back to life. I did it on a 2018 Mercedes genuine battery that was dead and wouldn’t hold a charge. Within an hour it was back to holding over 12.7v
 
OP
Dean Fletcher

Dean Fletcher

Senior Member
Joined
Mar 24, 2018
Messages
4,255
Reaction score
3,268
Location
Penrith, Cumbria
Your Mercedes
Mercedes E400
  • Thread Starter
  • Thread starter
  • #10
I know it’s a bit of a PITA but get the caps off of the individual battery cells. I expect there will be no electrolyte showing at all.
To get the caps off cut the sticker around the circular tops then with a screwdriver (and hammer...) knock them anti-clockwise until you can unscrew them.
Add some deionised water and put it back on charge. I expect it will spring back to life. I did it on a 2018 Mercedes genuine battery that was dead and wouldn’t hold a charge. Within an hour it was back to holding over 12.7v
Cheers BC loaf of sourdough owed!!
 

Bay Leaf

Senior Member
Joined
Aug 19, 2019
Messages
505
Reaction score
238
Location
Stockport
Your Mercedes
SL 350 R231 2013
I'm certainly going to try that Blobcat, as I looked at my battery the other day and on the side it said best before th 1st 2020
I checked it with a multimeter and it was showing 12.35v However the battery seems good as it starts the engine perfectly. When it does start to show signs of struggling I'll give it a go.
 

Blobcat

Moderator
Joined
Feb 8, 2006
Messages
38,986
Reaction score
27,747
Location
Grange Moor
Your Mercedes
R171 SLK280, Smart R451, Land Rover 110 County SW, 997 C2S, R1250 GSA TE 40th, CBR600FP
I'm certainly going to try that Blobcat, as I looked at my battery the other day and on the side it said best before th 1st 2020
I checked it with a multimeter and it was showing 12.35v However the battery seems good as it starts the engine perfectly. When it does start to show signs of struggling I'll give it a go.
It messes the tops up a bit but they’ll still seal again when screwed back in.
 

Bay Leaf

Senior Member
Joined
Aug 19, 2019
Messages
505
Reaction score
238
Location
Stockport
Your Mercedes
SL 350 R231 2013
I tried to get one of the tops off today but it wouldn't budge I looks like it has one way indentations (for the want of a better word) whereby you can screw them in but not out. I tried it using small drift but to no avail. I wonder if Varta use some kind of thread lock so you can't remove them. Also I watched a video on youtube that stated the battery charge state values can't be checked correctly using a multimeter on a stop start battery.

My battery is reading 12. 2v which by all accounts means the battery is on the way out, and yet it performs as it should. :confused:
 
Last edited:

Blobcat

Moderator
Joined
Feb 8, 2006
Messages
38,986
Reaction score
27,747
Location
Grange Moor
Your Mercedes
R171 SLK280, Smart R451, Land Rover 110 County SW, 997 C2S, R1250 GSA TE 40th, CBR600FP
I tried to get one of the tops off today but it wouldn't budge I looks like it has one way indentations (for the want of a better word) whereby you can screw them in but not out. I tried it using small drift but to no avail. I wonder if Varta use some kind of thread lock so you can't remove them.
They are tough... hammer and screwdriver round the outside edge... not pretty but as the battery was scrap already damaging it wasn’t going to make it worse...
Once topped up the lids screwed back in again and battery resurrected
 

Bay Leaf

Senior Member
Joined
Aug 19, 2019
Messages
505
Reaction score
238
Location
Stockport
Your Mercedes
SL 350 R231 2013
Ok I'll have another bash (pardon the pun) when it starts to faulter .Incidentally how much longer did your battery go on for.
 

Blobcat

Moderator
Joined
Feb 8, 2006
Messages
38,986
Reaction score
27,747
Location
Grange Moor
Your Mercedes
R171 SLK280, Smart R451, Land Rover 110 County SW, 997 C2S, R1250 GSA TE 40th, CBR600FP
Ok I'll have another bash (pardon the pun) when it starts to faulter .Incidentally how much longer did your battery go on for.
Still going now :)
Back in another Sprinter
 

Tony Dyson

Senior Member
Joined
Aug 26, 2018
Messages
4,038
Reaction score
2,585
Location
God's Country
Your Mercedes
2014 C 220 CDI W204 OM 651
I replaced both my original batteries just over 12 Months ago when they were losing charge, still starting the car at 12.2v but with winter approaching decided to replace anyway, took off the tops, topped up the electrolyte with between 125-150ml in each cell with deionised water and they're still performing well with good autonomy in a back-up power application I have at home, you just need a little more brute force and ignorance with the tops.
 

Bay Leaf

Senior Member
Joined
Aug 19, 2019
Messages
505
Reaction score
238
Location
Stockport
Your Mercedes
SL 350 R231 2013
20201127_153059.jpg Done today, using a pair of circlip pliers opened up and pressed into the cap using a small block of wood under the palm of my hand so they would dig in and then unscrewed them. All the cells were dry, I must have put in about a liter of water. I did a check using the multimeter and the voltage came up to 12.6 and I think it would have climbed higher but I was happy with that, so I put it on a low charge for about an hour. So time will tell.
 
Last edited:
Top Bottom