Glad the App Killer app helped.
I mentioned above that I sometimes have rapid battery-drain problems with my old Color Nook. But it's never been serious enough to investigate much (unlike your very rapid drain).
However, I've been paying more attention lately and noticed that it often drains quickly after it's been charged, going from 100% down to about 75% over night (sleeping; WiFi off). Then it seems OK for say 3 or 4 days.
I had a very bad rapid drain problem with my Nook Simple Touch (which I have posted a lot about in other threads), and that was solved by rebooting (turn completely off by holding the power button in, etc) after each recharging. So I wondered if rebooting like this might help the Color Nook. Well, it does seem to help. If I reboot the Color after recharging, it doesn't do that rapid initial drain over the first night asleep. It drains in a more even fashion and lasts about 2 days more, giving me about 5 or 6 days, depending on how much I use it.
The trouble is that with a Simple Touch, I only have to recharge it every 3 or 4 weeks, whereas with the Color I have to recharge it every 5 days or so, so that is a lot more rebooting with the Color. Anyway, batteries are mysterious beasts...
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