There have been issues in the past with something interfering with the sleep screen, so that the device never really falls asleep.
Please don't overreact; try working with the community to track down the issue.
Do you have an SD card in it?
What level of f/w are you using?
Had you actually charged the unit fully on receiving it?
The batteries do take a few charge / discharge cycles for the unit to calibrate the battery.
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