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Sounds like your car's original OEM battery is finished or you have an electrical issue. Either way I'm surprised your dealer is not standing behind the warranty. If it's a CPO warranty they should have checked the electrical system including the battery to make sure it's within working specs.
It's true that leaving your car unlocked will leave some of the electronics "on" initially but they should turn off after a short delay period. This will not drain a battery that is in good condition.
I have a 7 year old Sears/DieHard that works flawlessly in my unlocked (don't tell anyone) '97 Boxster. I do use a Ctek 3300 multi maintainer if I'm planing on prolonged period on no use, but not for day to day use.
Many have had bad luck with the OEM batteries, and Porsche has been known to void the battery portion of the new car warranty on low mileage cars that aren't kept on maintainers, but as you said this is ridiculous for your dealer to deny coverage on a two week old purchase.
Hope they come to their senses.
Aron
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