Most modern cars have things that are always slowly draining the battery but it should last longer than 3 days. I'd take the battery in to be tested at your local Auto Parts.
Well, something is draining the battery. Recharge the battery, and have it load tested. If that tests okay, check for voltage draws while the car is off. Pull all fuses, test again. Alternator diodes are a common culprit and would not stop the draw with all fuses pulled. Keep going until you identify the offending system.
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