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^ Do a "carbon pile" test on the battery. Thats basically when they hook up a small ($30) device up to the battery, while it measures the continual voltage as it drains significant amounts of amps. The more of a voltage drop, the weaker the battery.
You can do it yourself, as they can be picked up at any auto parts store for $20-$50++ most times. They come with instructions as per how to use them. That way you can know what to expect, and not be taken advantage of if another shop suggests you may have to replace the battery that you just bought.
I still find it odd that you have this problem. So you checked ALL the fuses for ANY current draw? That is seriously odd. Another thing that they can do (or yourself) is to check the actual charging system power of the altrenator. Your Alt should do around 60-80amps at idle, and do 120-160amps at 2,500 RPM +
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