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Old 07-13-2007, 12:27 PM
Registered User
Join Date: Jul 2007
Posts: 2
SL 55 AMG Battery Acid Exploded Need Help?

Hi my name is Paul I could really use some help. I own SL 55 AMG which is currently out of warranty. The other day the battery exploded and discharged battery acid all over wiring harness which now needs to be replaced. No idea what caused this to happen the question is what do I do now given the situation. My service Rep claims this has never happened and cost of repairs is $4000. He claims the Mercedes will split the cost of repairs with me. I however think Iím being misled, sounds like a manufactures defect to me. Has anyone ever heard of battery acid leaking and destroying the wiring harness to the vehicle? If so how should I proceed with Mercedes and my service agent?

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Old 07-13-2007, 12:48 PM
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Join Date: Dec 2006
Location: Colombia
Posts: 194

I have seen batteries explode on trucks but never on small vehicles. It can happen because of loose conections on the battery terminals or a defective battery. I think there is a very small hole on each battery cap to release pressure.

You should also wash the battery area very carfully with water mixed with soda to remove any acid and prevent corrosion.

It's a very rare situation. Have you talked to the battery manufacturer?
1995 E320 Sedan
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Old 07-13-2007, 02:17 PM
david s poole
Join Date: Mar 2005
Location: dallas
Posts: 1,822
the alternator regulator going defective and allowing the alternator to charge up to 18.5 volts could be the cause of this.
David S Poole
European Performance
Dallas, TX

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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Old 07-13-2007, 04:04 PM
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Join Date: Feb 2004
Location: Walnut Creek, CA & 1,150 miles S of Key West
Posts: 4,874
I'd be looking for some sort of assurance/explanation that the problem has been identified and resolved before putting a new harness and battery into it.

Good of them to offer to take care of half the problem.
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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Old 07-13-2007, 06:43 PM
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Join Date: Nov 2002
Location: Milford, CT
Posts: 19,318
Have them check the output from the alternator, it could be overcharging.

Doesn't that car use a sealed AGM battery?
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Old 07-14-2007, 12:24 PM
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Join Date: Dec 2003
Location: Palm Springs, CA
Posts: 782
Exploded battery

The same thing ALMOST happened to me on our '87 300E. We detected a strong, strange smell and I took the car to our mechanic. The battery had split and was starting to leak. Yes, it was the alternator overcharging and NOT shutting down.

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