Why does the iphone4 not hold a fully charged battery overnight?

I charged up the iphone4 to 100% last night; left the phone powered "on" overnight - I have done this every night for the past two weeks.  But, this morning, the iphone4 showed a very low, almost dead battery picture with a thin red line at the end of the battery.  What would cause the fully charged phone to lose all charge overnight, in less than 10 hours?

Two possibilities:
1. The charge level indicator needs recalibrating - discharge the battery completely, then charge it fully
2. Something is running and using power. Restart the phone (Home and Sleep pressed until the Apple logo appears)
There might be a fault with the battery, but these two are more likely

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