A digital camera will drain the life out of an alkaline battery faster than Dracula on a peasant. Make sure to buy alkalines that are specially designed for high-drain applications. Maplin batteries, for example.
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Peterson, Planet Green, Josh. "5 Ways to Extend the Life Of Your Household Batteries" 06 December 2011. HowStuffWorks.com. <http://www.howstuffworks.com/everyday-tech/extend-battery-life.htm> 24 May 2015.