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The best thing you can do for battery life is: not using the touchscreen (stylus in it's pocket, there's a switch) turn off G-sensor, avoid WiFi and audio player.
Book formats and page refresh do not influence battery life that much. If you want to know about the exact state of your battery the only way is to open the device, remove the battery and let it test by an expert.
Otherwise 1000 to 2000 pageturns is completely satisfying...
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