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Mine is like Joykins; 6% per hour for reading, .5% per hour in sleep mode, 20%per hour with WiFi. For each charge, I get around 15 hours of straight reading.
I also monitor the power usage in reading mode without turning the page and found the unit still drains at 4% per hour. That means page turns use very little power (only 2%) and most of the power is used to perform backgroud applications, such as checking the touch screen circuit (even when it is power off) and other monitoring functions. I just wish that I'm proficient in the Android OS; it would certainly be a fun project to modify the SW and see how each function affects the power.
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