Greetings and my thanks for the previous comments.
I replaced my battery today (11/27/10) in my 2003 ML-350 and wanted to share my research and replacement experiance. This is my second replacement and the first I have perfromed on this car.
- Regarding the Autozone information - I checked battery previously mentioned in this forum (Duralast 49-DL) and their website reported it was not the correct battery for my vehicle. The battery they listed as correct is the H8-DLG. Price as of this date was $135+Sales Tax.
- Checked Sears Diehard site and was unable to locate a battery for my vehicle.
- Checked Interstate site and found MEGA-TRON PLUS - 85 MONTHS - 850 CCA Product ID MTP-93 for $136+Sales Tax.
- Called my local MB dealer and was quoted $135+Sales Tax.
Decided to go with the known item and drove to the dealer with the old battery. Removal was a bit of a chore due to to confined space and removal of surrounding components. I recommend the following sequence based on my experiance.
1. Remove rubber "bumper" along battery comparment area.
2. Remove L shaped surround piece. This will require opening a hinged plastic piece that closes over the slot that allows the Positive cable to pass through the battery compartment surround.
3. Remove the bolt at the front lower end of the battery compartment. This holds the battery mettal surround and the battery in place. You will need to lift up the back end of this piece to allow the front end tabs to be lifted from the slots holding the piece in position.
4. On the top of the battery under the restrining metal band, you will need to depress and lside a plastic piece towards the rear of the battery. This will allow the metal restraining band to be depressed a bit. THis lower end of this band can then be unhooked from a rolled rim on the plate the battery rests on. I was unable to determine how to disconnect this group of parts any further and just ended up sliding the battery out from under the restraining band once it was loose.
5. Remove the Positive cable from the battery. I also seperated the small cable bolted to the main Positive cable. Is was easier to get the Positive cable out of the way.
6. Remove the Negative cable. Very tight space constraints here!
7. Slide the battery forward a bit then angle the front of the battery up and lift the battery out. It is quite heavy! I did it in 3 steps. I also placed a heavy towel over the area in front of the battery compartment to reduce potential damage to plastic parts and scratching anything.
8. Get new battery!
9. Repeat process in reverse order except attach Negative cable first then attach Positive cable
. Do this step after completing all other steps. Also note that the Negative cable must go behind the battery and not over the top or you will not be able to reattach the connection.
10. Test start car.
11. Enter MCS(Radio) security code.
12. Enjoy your car!