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Why does file size of the book make a noticeable difference? My epub file sizes range from 3 MB to 6 MB. I can leave the device in sleep mode at 90% and then when I start reading again, if I look at the battery percentage a few minutes later it is at 75% or even less. WiFi is off.
I am not using an SD card. Does using an SD card increase or decrease battery life?
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