My Nook Tablet is fully rooted and the battery was not holding too well.
I installed Juice Defender Plus for either .99 or 1.99 (I forget) and just let it run in default mode.
My battery life is appreciably better now. The App states that it has improved performance by a factor of 1.67.
This "Plus" version allows you to power-tweak settings as well if one really wants to go for the gold in time between charging.
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