My car has a death battery and the key is not opening the trunk, it turns but does not unlock.

 

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Wlcome to the forum, grosas~

Charge, jump or replace the battery!

Simple solution.

Plan on getting a nice, new battery for the car, too. The X-Type is notorious for eating batteries, especially when they are not driven for a while. There is always a small draw off the battery, and if not left on a battery tender it will just munch them.

If the battery has been dead for any great length of time, chances are it will need replacement. Buy the best one that you can afford. Funky or marginal batteries are one of the main sources of many, many "apparent problems" - weird codes, Check Engine Lights, performance issues, etc.

If you have a tip-down rear seat, you can get into the trunk that way - should your new battery or your charger be back there. There is also an emergency open handle back there inside the trunk, too - if you can reach it or find it.

Best 'o luck, and welcome.