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Pelican Technical Article:

Battery Removal

Kerry Jonsson

Time:

1 hour1 hr

Tab:

$150

Talent:

**

Tools:

13mm socket with ratchet or wrench, 10mm socket with extension and ratchet

Applicable Models:

Mercedes-Benz R129 (1990-02)

Parts Required:

Battery

Hot Tip:

Always remove the negative terminal first to prevent short circuits

Performance Gain:

Improve starting in cold weather

Complementary Modification:

Replace battery terminals if excessively corroded

One of the most common causes of a "no-start", "no-crank" condition is a weak or dead battery. A typical battery lasts 5 to 7 years providing you do not have any problems. A bad alternator may not properly charge your battery. Short trips and stop and go driving also reduce the time an alternator can charge the battery. This can reduce battery life. If you allow the battery to go dead often or let the car sit dormant for a while will also reduce battery life. In this tech article we will go over all the steps to safely change you battery.

This photo illustrates the passenger side of the trunk.
Figure 1

This photo illustrates the passenger side of the trunk. Look on the upper side of the side panel. Remove the plastic push-pin by removing the inner pin (green arrow) out and then removing the whole pin (yellow arrow)

Pull out the top of the trunk side panel in the direction of the blue arrows.
Figure 2

Pull out the top of the trunk side panel in the direction of the blue arrows.

Working at the battery, identify the negative battery post tightening fastener (green arrow) and the positive battery terminal tightening fastener (yellow arrow).
Figure 3

Working at the battery, identify the negative battery post tightening fastener (green arrow) and the positive battery terminal tightening fastener (yellow arrow).

Using a 13mm wrench or socket w/ratchet (what we are using here) loosen the clamping fastener.
Figure 4

Using a 13mm wrench or socket w/ratchet (what we are using here) loosen the clamping fastener.

You can use a flat head screw driver to spread apart the battery terminal to loosen it.
Figure 5

You can use a flat head screw driver to spread apart the battery terminal to loosen it.

You can also use a pair of pliers to twist the battery terminal loose to break the corrosion.
Figure 6

You can also use a pair of pliers to twist the battery terminal loose to break the corrosion.

Loosen the 13mm clamping fastener (green arrow) and remove the positive battery terminal.
Figure 7

Loosen the 13mm clamping fastener (green arrow) and remove the positive battery terminal.

Working at the back of the battery remove the 10mm fastener and battery hold down bracket (green arrow).
Figure 8

Working at the back of the battery remove the 10mm fastener and battery hold down bracket (green arrow).

Grab the battery by its handles and lift if out of the trunk cavity.
Figure 9

Grab the battery by its handles and lift if out of the trunk cavity. The battery is somewhat heavy so be prepared.

10: If you are inclined you can replace your battery tray.
Figure 10

10: If you are inclined you can replace your battery tray. A very small amount of battery acid can leak out of the battery vent during use and start to corrode the battery tray. Remove the two 10mm fasteners that hold down the battery tray. These fasteners may break from excessive corrosion so be prepared to drill out holes and install new fasteners. Installation is the reverse of the removal steps. If you have replaced your battery tray insert the new one and tighten down the two fasteners. Install the battery, battery hold down bracket and tighten the mounting bolt. Fit the positive battery terminal first and tighten it down before installing the negative battery terminal. Only when the positive battery terminal is tight install the negative battery terminal and tighten the terminal down. Start the engine to verify the battery terminals have a good connection. Install the trunk passenger side cover and insert the push pin to secure it.

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Comments and Suggestions:
slickron Comments: I have been reading that some SL's batteries have to be vented because they are in the trunk. Is this so with the 1998 MB SL500?
November 12, 2016
  Followup from the Pelican Staff: If the battery is in the trunk, it has to be vented. There will be a small port with a hose attached to the vehicle body and battery. - Nick at Pelican Parts  
Red Comments: Put in new battery 95 mercedes sl320. Everything comes on but car won't start?
August 15, 2016
  Followup from the Pelican Staff: Check for a loose connection. If good, voltage drop test the battery cables to the engine and starter. - Nick at Pelican Parts  
Black Beauty Comments: @005 Mercedes SL 500 need to replace accessory battery located in trunk, will the vehicle require reprogamming after installation
August 1, 2016
  Followup from the Pelican Staff: Yes, I believe so. - Nick at Pelican Parts  
Larry Comments: I have a 93 Mercedes 500sl. I would like to know if I can use a 600 CCA battery in my car. Will I have any problems and will it work? I live in NH.
December 8, 2014
  Followup from the Pelican Staff: What came in it stock?

If you need a fast response, give our parts specialists a call at 1-888-280-7799. They can help you find the right part.
- Nick at Pelican Parts
 
bobla53 Comments: trickle charged battery and then took it off to fully charge......although engine turns over well alas ccar wont start 91 merc 300 slbobla53
April 2, 2014
  Followup from the Pelican Staff: I can't help without knowing what is missing from the system when you are trying to start it. When your engine doesn’t start you’ll want to check the basics. Check spark, fuel injector pulse and pressure fuel, volume and quality. Are there any fault codes? Once you figure out what is missing, it will be easier to diagnose.
- Nick at Pelican Parts
 
nj300sdl Comments: W129
February 16, 2014
  Followup from the Pelican Staff: Applies to W129 / R129 (1990-02) - Nick at Pelican Parts  

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