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my guess is that depending on file size / format and compilation, battery
life will vary from user to user despite usage with or without lights. It might take more
processing power to open / index / and read a large (badly compiled) file vs. a generic
rtf or sony reader file. Unless this is tested, I believe we will see different battery ratings
across the board. My other guess, would be perhaps an additional drain for the live
touch screen digitizer. Again, I'm only guessing here.
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