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Pelican Technical Article:

Battery Removal

Kerry Jonsson

Time:

30 minutes30 mins

Tab:

$200

Talent:

**

Tools:

10mm socket, 13 mm socket with ratchet and extensions, 10 mm wrench

Applicable Models:

Mercedes-Benz W211 (2003-09)

Parts Required:

Battery

Hot Tip:

Always disconnect the negative terminal first

Performance Gain:

starting problems from a week battery

Complementary Modification:

Clean out your trunk

Although your engine provides power to make the vehicle move it still needs an electric starter motor to turn the engine until it runs on its own. This electrical starter motor is going to need stored electrical energy. The battery in your car contains the stored electrical energy needed to run the starter. Batteries use a chemical reaction to generate this electrical charge. After about 5 to 7 years the battery loses its ability to hold a charge. This will lead to hard starting or no start condition. In this tech article we will go over the steps to replace your battery.

We recommend you replace the battery every 5 to 7 years

This picture illustrates we are in the trunk.
Figure 1

This picture illustrates we are in the trunk. Lift up the lower trunk cover from the floor using the clasp.

Lift up on the trunk cover and hook it on the upper rim of the trunk.
Figure 2

Lift up on the trunk cover and hook it on the upper rim of the trunk. The clasp is made to grab the trunk seal and hold the cover up.

Lift out and remove the molded carpet panel underneath the lower trunk cover.
Figure 3

Lift out and remove the molded carpet panel underneath the lower trunk cover.

The battery is located on the right side of the trunk.
Figure 4

The battery is located on the right side of the trunk.

Starting at the negative terminal, loosen the 10mm fastener and pull the battery cable off from the battery terminal.
Figure 5

Starting at the negative terminal, loosen the 10mm fastener and pull the battery cable off from the battery terminal. Cover the negative battery terminal with insulating material to prevent it from coming in accidental contact with the battery.

Moving to the positive terminal, loosen in the 10mm fastener and pull the battery cable off from the battery terminal.
Figure 6

Moving to the positive terminal, loosen in the 10mm fastener and pull the battery cable off from the battery terminal.

This picture illustrates the back of the battery.
Figure 7

This picture illustrates the back of the battery. Pull the vent tube off its port on the battery.

There is a strap to help hold the battery in place.
Figure 8

There is a strap to help hold the battery in place. Push down on the latch and pull to loosen the strap. You do not have to remove the spare tire to remove the strap. We have done so for photographic purposes.

This picture illustrates the front of the battery.
Figure 9

This picture illustrates the front of the battery. Remove the 13 mm fastener (green arrow) that holds down the battery mounting bracket.

Once the fastener for the hold down is loose, remove it from the battery tray.
Figure 10

Once the fastener for the hold down is loose, remove it from the battery tray.

You can now lift the battery out of its place by the handles.
Figure 11

You can now lift the battery out of its place by the handles. Installation is the reverse of the removal steps. Position the battery in its place and fit the bracket and fastener. Wrap the strut around the battery and tighten the strap by pulling on the end of it. Install the battery vent tube. Fit the positive battery terminal first and tighten. Fit the negative battery terminal second and tighten the fastener. Fit the lower carpeted cover over the spare tire and then lower the upper trunk floor cover.

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Comments and Suggestions:
timr Comments: What does the small battery under the hood do then, if everything is de-energized when you replace the main battery in the trunk?
November 28, 2016
  Followup from the Pelican Staff: http://www.pelicanparts.com/techarticles/Mercedes-W211/71-BASICS-Auxiliary_Battery_Replacement/71-BASICS-Auxiliary_Battery_Replacement.htm - Nick at Pelican Parts  
HoneyBadger Comments: My car died and need to know which battery do I get charged with jumper cables? Under the hood or in the trunk? Which battery charges what in the car? I have 2004 E320. Thanks!
October 4, 2016
  Followup from the Pelican Staff: Confirm in your owner's manual, but there should be jump start specific terminals under the hood. - Nick at Pelican Parts  
2004 Comments: Can you keep the car energized by using another car battery and a pair of jumper cables attached to the battery terminal connectors?
August 17, 2016
  Followup from the Pelican Staff: No. - Nick at Pelican Parts  
vj Comments: what do you mean by initializes the windows and reprogram the personal option. Thank you. vj
June 26, 2016
  Followup from the Pelican Staff: Personal options like memory seats, radio, etc. The window auto up feature has to be reinitialized.

- Nick at Pelican Parts
 
vj Comments: after replacing the battery on w211 mercedes what all the controls to be reset.
June 23, 2016
  Followup from the Pelican Staff: You may need to initialize the power windows and reprogram your personal options. - Nick at Pelican Parts  
Oldtrix Comments: is the location of the main battery similar for the wagon?
June 22, 2016
  Followup from the Pelican Staff: On W211 models, yes. - Nick at Pelican Parts  
JimB Comments: You can keep the electronics energized by hooking up a battery booster to your OBD connection with an OBD memory saver adapter.
January 21, 2016
  Followup from the Pelican Staff: That is not good practice. It can damage the electrical system. You don't want to feed voltage into the system through small low current circuits. - Nick at Pelican Parts  
Kevin Comments: Is there any risk of system computer issues after changing a dead battery? Or, any extra steps to take to protect the equipment?
November 17, 2015
  Followup from the Pelican Staff: No. you may have to reset some functions. Like clock, window auto features, etc. - Nick at Pelican Parts  
chubbize Comments: This was great step by step direction on replacing the main battery, But I need to replace the battery under the hood of my 2004 e320 Mercedes Benz. What style battery should I use?
October 24, 2015
  Followup from the Pelican Staff: See this article. The battery part is on the side of the page.

http://www.pelicanparts.com/techarticles/Mercedes-W211/71-BASICS-Auxiliary_Battery_Replacement/71-BASICS-Auxiliary_Battery_Replacement.htm - Nick at Pelican Parts
 
forp Comments: How do you keep the electronics energized?
October 22, 2015
  Followup from the Pelican Staff: You don't, during replacement. - Nick at Pelican Parts  

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