AA Batteries vs. Proprietary Batteries

I bought a Panasonic DMC-FZ28 camera from Costco. With a 90 day return policy and good reviews on the camera I believe the choice was wise. However, the camera has a proprietary lithium battery. A low battery warning light appeared about 3p.m. Sunday afternoon. Two hours later I was able to continue learning about the camera. The cost of an additional battery is $25.00. Now I am wondering if these batteries might not be available in the future and that would obsolete the camera. AA batteries are available almost everywhere (like a general store in Yosemite or in Paris?).

So is the light weight lithium battery really that good if the cost is high and the availability is in doubt? Send me your opinion!

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