I've an N905C that powers down when not used for a while. It's set to Never and battery is good. It's fine regarding sleeping after 15 min no use. It doesn't sleep while in use. However the powering off is odd.
The Sony readers I have will ALWAYS power down from sleep eventually.
AFAIK no Kindle has any sort of power off, which is unfortunate if it's used very infrequently.
Not sure what my Nook does, though you can manually power it down, unlike a Kindle.
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