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I get about a week to 10 days with airplane mode on, reading about 2-3 hours a day. I don't spend a lot of time browsing around on it, just reading, so the LCD is mostly off when I use it. I noticed a little while back that I was gradually losing battery life, needing to charge up twice a week instead of just once. I bought a new battery at B&N and that solved it. I'd had it for just about a year.
Have you tried rebooting your nook? Since it's a computer, there's always the chance that a hung application or other issue in the background is what's draining your battery.
Also, the percentage display for the battery seems to go down very quickly, and then hang out under 20% for a good long while. When I try to intentionally run it all the way down I still get a couple of hours of reading (two hundred or so page turns) after the "you should plug in your nook" warning.
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