your battery problems seems more severe than ours since you've only had your car 4 months while we have had ours nearly 3 years; however, the frequency of the battery dying is still unacceptable. just a couple weeks ago, our battery died for the 4th or 5th time, and the dealer finally added an aftermarket device on the car that auto-shuts downs all electrical components should it detect a low battery level so that at least the car will start, but even this makes us feel wary about the car. the root cause of the problem is still left untreated. we got the "battery is bad" theory a couple of times, too at first, but now that it has happened to us so many times, they say it's because we don't put enough miles on the car.
we still haven't decided one way or another about keeping this car, especially with the warrenty about to run out.
keep us posted on your situation, and we'll do the same.