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Sony Reader, unless completely shut down via menu, is always ON. When you push power button, all you do is activating a "hold on" button. It clears the screen and will disables all buttons. However, the main CPU keep on running. That's the main reason, why Sony Reader will have a flat battery in 3-4 weeks time even though it was not used much or was not used at all.
so as I said, 3 weeks and 800 pages is a perfect battery life for the reader. How your wife manages to prolong it, I am not going to speculate. I don't know. I am sure I and quite probably you as well, don't know all the details.
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