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  #1  
Old 11-15-2013, 10:59 AM
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Battery change procedure

2008 E320 Bluetec

I need to replace the six year old battery. Can I simply remove the old battery and install a new battery or do I need to use another battery to maintain voltage to the system while changing the battery?

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  #2  
Old 11-15-2013, 11:30 AM
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Quote:
Originally Posted by DDAY View Post
2008 E320 Bluetec

I need to replace the six year old battery. Can I simply remove the old battery and install a new battery or do I need to use another battery to maintain voltage to the system while changing the battery?
Most new batteries have a charge in them, so you can swap it and start the car and go.
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Old 11-15-2013, 11:36 AM
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Quote:
Originally Posted by eatont9999 View Post
Most new batteries have a charge in them, so you can swap it and start the car and go.
I think he is concerned about computer/security systems. Is constant voltage needed while changing the battery?
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Old 11-15-2013, 12:32 PM
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Hmmm... I'd get one of the battery clamp savers... you could use a jump box with a cord plugged into the cig lighter outlet with the key in the acc position...
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Old 11-15-2013, 12:49 PM
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Quote:
Originally Posted by DDAY View Post
... do I need to use another battery to maintain voltage to the system while changing the battery?
I would do that. And because I do not know what would or wouldn't work, I would do it at the battery cables with the key off. So when you are done, the car would be "like it never happened".

Or, you could call the dealer for advice.
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  #6  
Old 11-15-2013, 01:15 PM
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Just swap the battery and re-synch the windows, sunroof, and steering angle sensor. If the instrument cluster is synched with the COMAND head unit the clock will re-set itself. Check your seat/steering column memory. If the pre-set positions are still stored you're done. If not, you'll need to re-synch the motors.
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  #7  
Old 11-15-2013, 01:34 PM
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key off is safer, but you'll have to be careful when disconnecting the battery if you have a battery saver attached to the cables...

autozone has a memory saver that plugs into a jump box, that has alligator clips to attach to the motor, or the jumper cable connectors.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #8  
Old 11-16-2013, 01:01 PM
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I have a little number that you snap on a 9v battery on one end (like in smoke alarms) & then plug into the cig lighter. Works on cars that have cig lighter ALWAYS hot. 9v is enough to save radio settings.
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  #9  
Old 11-16-2013, 01:04 PM
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Quote:
Originally Posted by cornemuse View Post
I have a little number that you snap on a 9v battery on one end (like in smoke alarms) & then plug into the cig lighter. Works on cars that have cig lighter ALWAYS hot. 9v is enough to save radio settings.
that'd work if you have an always hot 12v socket installed in the car... but it would not work on a stock benz, because the electrical system would suck the battery dry almost instantly...
you could use a clamp on 12v socket connected between the body of the car, and the glow plug relay lead (it's hot all the time) or the starter lead if that's easier to reach... the large wire on the alternator lead would work also...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #10  
Old 11-16-2013, 02:54 PM
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You could make up a battery box with 8 AA lithium batteries with a cig plug on it and plug that into the outlet with the key in ACC position. That'd have plenty of juice to keep the system happy while changing a battery. And it would provide a full 12v
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  #11  
Old 11-16-2013, 03:34 PM
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For a simple issue like this, Id be calling the dealer and using their recommended procedure.

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