What could be shorting out the battery? Does the chip in the key need adjusting?
could be a interior light inside the car itself or under the hood, or trunk even curb lights on the doors.
You clearly have a short somewhere in the car. If you are not good at finding a shorts, it may take a while but a simple method in finding a short would be to remove a fuse at a time and if the battery discharges you will know thats not the circuit with the sort.
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