Originally Posted by HarryT
The screen doesn't drain power, but other things - the CPU, RAM, etc - certainly do. You'll drain the battery in 4-5 days if you leave the machine switched on.
My was "on" for a week. No change in battery level (steady at 60%). For reference it has Mobipocket Reader version 6.0 (build 60). I don't know which flash version that is supposed to be, but the battery-indicator-bug is not on mine.