MY BATTERY IS DEAD AND I CAN NOT OPEN THE TRUNK. on 2004 Mercedes-Benz E55 AMG

I TRIED THE KEY TURNIG IT LEFT WHILE HOLDING THE HANDLE. IS THERE ANOTHER POSITIVE POLE NOT THE AUXILLARY BATTERY THAT I CAN JUMP. THAT BATTERY IS FULL BUT NOTHING IS RESPONDING-I AM IN THE CAR VVUT IAM NOT GETTING NOTHING. HOW DO I OPEN THE TRUNK?

Asked by for the 2004 Mercedes-Benz E55 AMG
Find the post forward of the driver side fuse box in the engine compartment. This is where a bunch of wires come together. This is a positive terminal. Attach red jumper here and black to any bare metal bracket in the engine.
2 answers
Just use the metal key .Pull it out of the plastic ,electronic key and put it in the key slot which is next to the trunk handle and turn it .The trunk should open even if the battery is dead.No need to go under hood.Well it works on my 2003 amg 55