Sl500 mercedes-benz won't start after dead battery

SOURCE: Mercedes Benz 2002 C Class 180. Key fob batteries

You have to seperate the front of the fob casing by sliding or prising at the side this will then reveal the batteries. You can get replacement batteries from most garages or your MB dealer (who will probably fit them as well)

SOURCE: battery is dead and can't open the trunk, even manually

Starter motor on this car is imposible to get to..better find the post forward of the drivers side fuse box in the engine compartment where a bunch of wires come together. This is a positive terminal attach red jumper here put the negative jumper on any bare metal bracket of the engine

SOURCE: My 1994 Mercedes Benz SL500 radio display turns on, but no sound?

I had same problem with my 1994 SL600. Also when this happens you will lose your interior door lights when you open the doors. My problem was solved by taking out the, A-white 40 amp 12V Relay and cleaning off the 6-prongs and reinstalling. It is located in the box underhood ahead of the main fuse box. Just need a phillips screwdriver. It is the fartherest relay in back left. I had to pull the one out in front of it to be able to remove the white one. You can hear it click when you push in dooropen switch. When working right you do not hear it. Hope this helps.

SOURCE: After a dead battery, the electric windows on my

Lower all windows,enter car shut all doors +boot.Raise and lower all a few times,Raise all should reset.

SOURCE: My 2000 Mercedes Benz S500 is dead- electronic key does not

It's not that unusual for a battery to fail that soon, and the "no lights, no nothing" says that it's the battery again. Your best bet at this point is to pull the battery and take it to the point of purchase for testing. They should either replace it under warranty or charge it for you. After you replace the battery you should have the charging/electrical system checked for possible shorts or power drains.
BillB