my batery goes dead wen i turn car off on 1996 Dodge Stratus

is it my altanator or batery

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2 answers
Di dyou check to make sure nothing is on like the glove box light or trunk light. Without a multimeter you're guessing but is the battery light on when the car is running? IOf not then it may be a battery. This has to be a replacement battery in the car now anyway.
test it with a voltmeter, with the engine running it should have 14+ volts otherwise the alternator is bad. and your battery 12.6 atleast with the car off once it is fully charged