S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

Charging consumer battery on 2007 S550

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Old May 12, 2010 | 10:03 PM
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JosanK's Avatar
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2003 SL55 2007 S550
Charging consumer battery on 2007 S550

I just picked up a 2007 S last week. I just discovered it has a consumer battery in the trunk. I've had a 2003 SL55 for 7 years and I have learned (the hard way) that it's a good idea to trickle charge the consumer when you're away for a couple of weeks. I rigged up a charging plug on the SL55.

It's my understanding that on the S550 that the consumer can be charged from the front by removing a plastic cover on the passenger side in the engine department that exposes a tall brass pin. This pin is the positive and the ground can be anything (such as the ground on the starter battery).

Is this information correct? See attached picture.
Attached Thumbnails Charging consumer battery on 2007 S550-wheretocharges550consumer2.jpg  
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Old May 13, 2010 | 04:42 AM
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Diesel Benz's Avatar
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Originally Posted by JosanK
I just picked up a 2007 S last week. I just discovered it has a consumer battery in the trunk. I've had a 2003 SL55 for 7 years and I have learned (the hard way) that it's a good idea to trickle charge the consumer when you're away for a couple of weeks. I rigged up a charging plug on the SL55.

It's my understanding that on the S550 that the consumer can be charged from the front by removing a plastic cover on the passenger side in the engine department that exposes a tall brass pin. This pin is the positive and the ground can be anything (such as the ground on the starter battery).

Is this information correct? See attached picture.
Yes, you can charge the rear battery from the pole you have shown and the front battery ground pole.

The SL should survive two weeks parked easily, if it does not, it must have an issue.
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Old May 13, 2010 | 01:33 PM
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Ahmedito's Avatar
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07 S550, 08 Escalade, 08 H2
I'm leaving for 3 months, is there any suggestions for me to do with the battery?
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Old Jul 11, 2018 | 03:08 AM
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Charging my rear consumer battery on my 2007 S550

This was helpful in charging my 2007 S550 rear battery. I had left it for 4 months and need to charge it. Where is the photo is the ground post you mentioned? I'm using a body bolt to ground. Thanks
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