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I agree with Jack, your device seems to have some sort of issue (hardware??) related to the battery. Mine is on about 40% light, every page refresh, read couple hours a day on average and periodically download over wifi and install new beta firmwares and I'd say I get a least 2 weeks out of it. Never gets turned off (except during firmware installation when it powers off and on), so it's always sleeping. You shouldn't need to do anything special to get decent life (more than 9 hours reading) out of it.
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