Try disabling your live wallpaper.
Many live wallpapers are battery hogs -- especially if your screen is coming on as you describe.
I have the same basic problem... I'm wondering if this is normal or if I have a problem. (I had the original nook which lasted for days on a single charge... so this is frustrating.)
I have even followed these steps:
1. Restored the default image.
2. Turned wi-fi off. (No other config change.)
3. Rebooted. (Cold boot.)
4. Done nothing other than read books.
Even doing the above my battery will be at about 15% at around noon the next day. Even if it was at 100% at 10pm the night before. I read for 90 minutes last night and perhaps an hour or two this morning. Nothing else was run. Getting 3 to 4 hours of battery while doing only reading is very frustrating. It is worse if I actually do anything else.
I wonder if a certain amount of these units have a battery problem and I just happened to get a bad one.
I got rid of the live wallpaper and keep the wifi off most of the time unless I need it and it has helped dramatically. I did test the wifi theory and my battery dropped 8% in 30 minutes of reading with the brightness turned all the way down wit the wifi on and only dropped 4% in 30 minutes with it off. Haven't tested the live wallpaper ion the same way.
I received a Nook tablet for Christmas. About a week ago - maybe a bit less - I fully charged my Nook. I disabled wi-fi, turned the screen brightness way down, set the sleep timer to 15 min., and read a book I had downloaded for about 1-1 1/2 hours, then turned the Nook completely off.
This evening, I got out the Nook, turned it on, and it said the battery was too low to be used!! The device was OFF - how could the battery drained, esp. with wi-fi turned off? I am not using an SD card. There should be nothing keeping it awake. I don't know what version of the OS I have, nor do I know how to get updates to it yet.
Is there a firmware bug that is causing my Nook battery to drain even when the Nook is turned completely off?
The first post in this thread has a comment on it that says, "Solved!" (something like that), but I didn't see any solution there - just more discussion about the battery problems.
If this was a common occurrence, I would think I would have read about it on the tech sites I follow on-line.
Anyone find a solution to this problem? I also emailed B&N, but I have had very little luck with tech support from ANYONE. They usually reply with a "canned" message asking for information I already sent them, or not answering the question at all so I am not expecting too much from B&N tech support.
Maybe it's like the iphone 4 reception problem? Job's answer: "there is no problem.You're holding the phone wrong".
Have you noticed that the battery % is shown when you tap on the battery/time icons at the bottom right of the screen - along with the wifi on/off? I would charge it, check that the battery says 99% at least, turn it fully off (hold down the power button until it asks you whether you want to shut down). Wait a couple hours, turn it on and check the battery %. If it's down any, I'd say there's a short somewhwere. If not, note the % and just push the on/off button quickly to put it to sleep. Wait a couple more hours and check again. Even sleep shouldn't run it down that fast without the music player, wifi, or email being on.
My NT keeps turning off without warning and then won't recharge correct. It stays off for hours then starts up and recharges but takes hours to get to 100%. Went to the store and got a new charger/then went back a couple of days later and they gave me a new NT. Shut down last night at 8pm and has been on the charger till now(130pm) Still not charged/on. Taking it back again for the 4th time.