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My Boxster starts just fine after 2 weeks
of sitting with no use and no special battery charger/maintainer. I have no aftermarket accessories. I'm parked with the doors unlocked. The Boxster generation is smart and lots of things turn off after a time so as not to drain the battery.
Any idea how old your battery is? When you do drive the car, how far do you drive it and are all the accessories (lights, stereo, a/c, etc) on when you drive it? An aftermarket stereo drawing extra power when on perhaps? Any hardwired GPS, battery chargers, radar detectors?
My bet is you need to have your battery checked with a load tester. I'll bet it is unable to hold a full charge.
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