Again, my experience echoes others - never power off (unless it's not going to be used for a week or so), just put it to sleep.
2-3 hours a day, 2 + weeks, charge on wall o/night.
And don't forget if you USB it, to make sure the PC doesn't go into power off mode after a certain time. This will actually drain (and bugger up) the battery.
And, silly though it sounds, a wall charger does give it more "oomph".
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