You don't use the car much and there is a constant drain even while parked and everything off (you don't have any aftermarket additions, chargers, etc that could be drawing extra power do you?). The draw shouldn't be enough to prevent starting based on my experience but then I have a good fresh battery, a tested charging circuit and I always drive 12+ miles when I take mine out for a run...usually 50 miles one way. Mine has been sitting for 2-3 weeks and starts immediately. It was not on a battery maintainer.
Check the fluid level in the battery. Most sealed batteries evaporate over time.
So the next thing to do is get the battery charged and check the voltage. Bad, go get a new battery. Then, if fully charged and right voltage, get it load tested and the output voltage of the alternator checked. If those all check out, then you go chasing what is causing the current draw by testing all the circuits by pulling a fuse at a time and noting the change with an amp-meter in the circuit between the battery and the car. A table of expected circuit draw is located
here .
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