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Q: what is killing battery that was bought 4mons ago,this is 2nd time its happened on 2000 Chrysler 300M

twice this has happened.
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A technician will probably have to test for a parasitic drain. In the meantime look around inside the car for something staying turned on like an interior light, or the glove box light.
after market alarm? powered sound system and after market radio? what kind of battery you have? you should get OEM battery on that car from the dealer.
not sure what type of battery it was replaced by a local shop in town. no after music but i do believe the alarm is after market, will check on that with wife. car was purchased from my sister inlaw.
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