Today morning, I disconnected my N900 from the charger as it was fully charged. I opened my Media player and it is showing no songs or videos although I can play the files from File Manager. After 5 minutes or so it showed battery low and after a few minutes later it turned off. Full battery drained to 0% in like 15 minutes.

Additional information:
There are just a few applications I have installed on my device as I just flashed it last week. Someone please help me out!