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Disabling the "screensaver" has no effect on powerdraw. e-ink screens only use power when the image on the screen changes. If an e-ink device is disassembled, the screen will continue to show the last-displayed image!
My battery life isn't as good so far as it was on my K2, but it's also a newer battery that hasn't been discharged/charged as often. Some types of rechargeable batteries have to "calibrate" before they start showing the long life they have in later service. It does seem to be behaving more now that all 300 books I dumped on it on day one are indexed.
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