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1998 SL 500
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22 Posts
Discussion Starter #1
I'm going to replace the battery on my 98 SL-doesn't want to hold a full charge anymore. I'm guessing it's probably the original battery(I bought it last year from the original owner)-probably lucky it lasted this long.

Any precautions (electrical/electronics)I need to take on replacing it myself?

Is it worth taking to a dealer for this??

By the way, everything works on the car perfectly. Top, windows, you name it. I just don't want to create a problem I don't have.

Thanks.
 

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187 Posts
My battery went flat last week after I didn't use the SL for 4 weeks, and soon after I charged it to see if there was an improvement, I got the ASR light and limp-home mode on a short test run.

After a new battery went in the ASR light hasn't appeared for the 200-300 kms I've driven so far. Maybe the battery was a factor, maybe not, but it makes me wonder how closely it's connected to the car's computer. Nothing else has happened since the change.

I had a specialist battery shop put in the new one because there is so much more that they know. For example, the breather tube was nonexistant on the old battery, causing some corrosion in the pan. The specialist fixed that and spent some time locating the breather hole to fit the tube through. He also gave me a 6 month date to return for a free battery check which includes hydrometer readings as well. Very thorough.

If your dealer can be that expert then obviously it's a no-brainer to have it done with them, but I don't think so. They will just stick it in and hope for the best like the previous owner's dealer did with the old battery.

Ken Silver
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~1993 SL500, glistening triple black, xenons, AMG facelift to 2002 style.
~1999 SLK 230 Kompressor, silver/black leather, CD, immaculate
~1999 Lexus LX470, sand/ivory leather.
~1999 Suzuki Grand Vitara. black & silver.
~ex 350SL, 230E, 280E, MX5, Jaguar Daimler and a lot of other makes not nearly as nice.

<img src="http://www.kensilver.com/newSLsig.jpg">
 

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1995 SL 500
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27 Posts
My battery also did not hold a charge. I called up the dealer Mercedes Benz of Tampa to get a quote on replacing the battery. They quoted me 220 dollars for replacement and the will check the electrical. That was a bit much for me. I decided to go to parts and replaced it myself for 160 dollars.
The parts counter suggested to call the roadside assistant and tell them you need a battery. They will come to you're house 24/7. They will only charge for the battery (160) and they will put it in for you.I believe you have roadside assistant for life, my car is a 95.
 

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clk350
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71 Posts
Don't know about the 98's, but in the earlier ones, the radio goes dead and locks out once power is removed.

There's a proceedure for reentering the codes through the radio to bring it alive again, but you need the radio code for your particular VIN. Hint...if the radio code is not in your docs', MB can get if for you. If they want to charge you an arm and a leg for a look-up, just get a regular oil change. At our dealer, the VIN and radio code print out on any sort of invoice.
 

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SL500, CL55, E350, E320
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3,205 Posts
Very easy to replace. As said by other posters, you need radio code handy because your radio will ask for it (5 digits) to work. I bought the new battery from MB dealer for $128. You can get it from other souces like NTB, Pepboys for $80.

Replacing it is just a matter of 20 minutes. As long as you have both [funtional] hands [:p] and a right state of mind [:p] you can do it.
 
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