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Get a fan that requires less power to run, or use a 9V ac adapter to run the fan and ditch the battery.
Edit: If you want to get really fancy, you would use pulse width modulation, depending upon your fan of course, to gain more life out of the battery. Do a search on pulse width modulation and brushless DC motor controllers for some insight. My guess is that this is more work than you are wanting.
-------------------- Just another spore in the wind.
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