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Originally Posted by RAH
I don't understand this. If the biggest impact (along with page turns) is "when the LCD is on" then what about it being on is the determining factor, if not the amount of TIME it is on?
Interesting that the page turns are a significant factor, but please explain what you mean about 5 hours and 10 hours being the same, but then that the time being on is a factor. Isn't the screen on 5 hours in one case and 10 hours in the other?
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Don't get the LCD and the eInk screens confused.
The LCD screen draws power when it's on - so the longer the LCD screen is on the more power it will draw. With the LCD time IS a factor.
With the eInk screen it's only redrawing the page that really uses power. Once the screen is drawn the eInk screen uses almost no power at all to maintain it's display. So in regards to the eInk screen the number of pages displayed is a bigger factor in power usage than how long those pages are displayed. Which means if you don't do anything that turns the LCD on it doesn't matter if you take 5 hours or 10 hours to read 166 pages - the power use will be almost identical since you're only using the eInk screen and it only uses power when redrawing the screen.
(Ok, yes the eInk does use a little bit of power when it's on. But it's such a tiny amount that time really isn't much of a factor over periods of less than a few days. That's why when the nook sleeps it can display an image instead of fully powering down.)