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I think the fact that the 600 uses the battery for other capabilities leads to battery life decrease vs the 505 or the 300. Keep in mind highlighting, drawing, checking dictionary, zooming, etc all lead to more screen refreshes. This depletes the battery more. After a number of charging cycles, I tend to get a good 2-3 weeks before needing to charge unless I am using Highlights, Dictionary or drawing, then I am more apt to charge it a little more often.
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