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either the battery is prematurely (terminally) ill or theres a constant draw in the vehicle. Charge it up, take off one cable, let it sit that way for you said 3 days right, If it's OK obviously there is a full time draw somewhere in the car. Might put a VOM on amperes scale on the lowest scale(micro or milli amps) & in series with the cable you took off & see if there's current flowing. I'd try the amps scale 1st then the milliamp scale 2st then microamps so you dont fry your meter if it's flowing alot of current.



Yep. And don't be surprised to see a draw of about 20-40MA, your clock and stereo memory can draw that much. (make sure the car door is shut too