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Originally Posted by Mrs_Often
Where did you get those numbers? And for what kind of usage are they (how many hours of reading a day, how many reading sessions a day (switching on and off or on and asleep etc.))?
I'm curious as to why sleep would cost (more) battery. What's it doing when asleep? Nothing right? It changed the screen once to display a book cover and as it's eInk, it doesn't cost any power to maintain the cover on the screen. Off-mode does this too. The only button both sleep and off mode react to is the on/off switch... So where's the difference in power usage?
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I got those number by doing a test myself. I normally read twice a day, and so, after a charge, I exclusively used sleep mode only until the battery told me it was time for another charge. I then repeated the experiment using power off each time I used the device. It's an acceptable test to get a rough gauge how long the battery lasts.
In sleep mode the computer is running with the book in memory ready to be displayed - it uses much more power than power off mode
ltr