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.
There should be a terminal under the hood that will allow you to attach a battery charger or get a jump from another vehicle. There is a positive terminal where the batter would normally be.
There should be a terminal under the hood that will allow you to attach a battery charger or get a jump from another vehicle. There is a positive terminal where the batter would normally be. There is also a small flap under the steering column that can be opened with a flat head. Once open you will find a button that will release the key.
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