My battery is dead and i do not have a trunk key

You should have a trunk lock cylinder in the trunk lid. Look to the right side of the license l plate by the license plate light and you will see a black plastic cover. Remove the cover to expose the lock cylinder then use your key.

I would have the dealer cut a new key to get the driver's door open - or use a spare. You can buy a small charger that plugs into the cig lighter.

The Ignition Key for a Lincoln LS
should open the trunk
I have a 2004

Jumping a dead battery is an unsafe practice

Raise it up in the front & put a battery
charger on the starter battery cable and
ground anywhere on chassis

YOU CAN PLUG IN A BOOSTER BATTERY INTO CIGARETTE LIGHTER IT WILL GIVE CAR BATTERY POWER TO JUMP START. AND YOU WILL HAVE POWER ALSO TO OPEN TRUNK ALSO TO REMOVE BATTERY.

Well, the first answer is right but doesn't solve the problem and the second answer is wrong as the battery is in the trunk.

Just had the exact same problem. Battery dead on 2005 ion due to head lights left on which causes the key to stick in ignition.

Could not get to the battery in trunk because key stuck and power trunk switch also dead (no battery power, catch 22).

Solution: I hooked up a battery charger to the positive terminal under the hood by the fuse box and the negative to the engine block and charged it for 20 minutes. You could also jump it using the same terminals.

use your ignition key to open the trunk, the key hole is hidden just under the opening button and to the right side

On the side of the smart key there is a mechanical key that slides out of one of the sides-There should be a little release lever retaining the mechanical key. It can be inserted into the trunk lock and turned to open the trunk. There are several other positions the key can be turned to place the trunk lock actuation in different modes- it should be in your owner's manual Hopefully I have been helpful

Pop open the hood (bonnet) on the left isde of the firewall there is a red/black battery connection so you can jump start the car without getting to the battery.

cover under bonnet with a big P on it and negative is anything metal on the engine