It's been my experience that 90% of the time the problem is too much resistance in one of the battery cables, usually the ground. Most of the time, cleaning the terminals and tightening the connection solves the problem. Changing batteries can be decieving because in the process of doing so you may have cleaned and tightened the connection, and the new battery certianly had clean posts. If it was your alternator, it wouldn't crap out and then be fine for two weeks. Odds are it was a dirty terminal. Always start with the simple stuff! It will save you a ton of money.
Take care
~Chris
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