Prestidigitweeze no I haven't done any kind of testing on the battery life. They aren't supposed to use any power once the screensaver is on, or once the screen has been switched off, so it shouldn't make any difference. If left even completely unused a battery will drain to some extent, but I think there is something in what Synamon has posted regards the WiFi being active/inactive in the two different sleep/off modes though, and that is possibly the key difference (and would have an effect on the battery life). The off mode still doesn't appear to be a proper switch off.... so in which case, as HarryT says, you can't shut it down. I know there are some differences with the button on the current generation of Kindles, but I presume the same is true of them too?
Anyway, it will be interesting to see if the battery life of the Nook is really that much poorer by having this lighting (even when not in use)?
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