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Probably the Battery, but maybe the Alternator too.
Sorry, but Porsche specifically does not warranty the Battery. They put out a TSB on this because early on, many dealerships were replacing the Batteries simply because people were not driving the cars enough and the power drain when the car was off was causing the Batteries to die, not a defect in the Battery itself.
Simple check - Take a DMM (Digital Multimeter) and with the car Off check the voltage across the battery terminals. Should be 12.6-13.2 volts. More is not good, less is not good.
Then, start the car and do the same check. Now you should see 13.5-14.5 volts - this is the Alternator voltage. More is not good, less is not good.
One caveat, you may have a cracked cell internally which may not affect the output voltage, but the amperage. But the DMM check is still worth doing.
Also, you could go to an Autozone, Pep Boys or such and get a free load test on the battery and alternator.
Batteries last somewhere between 3-5 yrs. on avg. Your's may be on the low side of that average. This could be caused by many things incl. poor manufacture, infrequent driving, too many deep discharges, even a good jolt from hitting a pothole or such can damage a battery.
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