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The real funny thing with the battery life issue is the page turns thing. What uses the battery most is turning pages and there are several things that can make a big difference from user to user. For example:
1) Font size. If you have 'older eyes' and use a big font you will be turning a lot more pages per hour. Even though its the same amount of text, its the number of page turns that matter.
2) Reading speed. It should be obvious, but a quicker reader is going to turn pages faster.
3) Re-reading older books. This is a tricky one, but I like to reread books. The issue is that once I've read the book before I skip the boring parts. For example, one author I enjoy a lot gets quite long-winded at times. If you find your self skipping pages by hitting the next page button you are also using up the battery faster.
Finally, I have noticed my K2 has short charge cycles after I connect it via USB to my laptop. I guess it could be due to indexing, but that hasn't been my guess. Some USB ports don't have enough power to charge and Dell's are notorious for that. I have assumed that my book is actually draining while its hooked to the PC. If I have to leave it on for very long, it ends up going through the battery quite fast for that cycle. It takes a cycle or two to normalize.
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