in the last week or 2 Ive noticed that the battery isnt lasting very long. i charge it completely too. and its not that the battery life just drops fast. the battery thing in the top corner of the screen will show that i still have a little over half the battery power left then BAM it dies on me. and tells me that no battery power is left or whatever it is it says.
does anyone know why this could be happening? and if there's any way i could fix it? its so annoying!

thats the one i have. they dont even make them anymore
EDIT: ok last night was when it died last, and the battery said it was over half when it died, like usual. so i just went to plug it in...but i thought id try turning it on...i held down the center button, the Ipod came on. the battery thing was empty. i plugged it into my speakers anyways, put on a song, its playing fine. then my battery filled up a bit
WTF!!!
Edit again: ok now it died again. buh. then i pressed the center. then it worked again. on empty battery looking. then i turned, looked back and the battery is half full. then, it made a noise (like it farted or something) and music quit coming out. i switched to my headphones in case it was the speakers, it was working fine, i switched it back to the speakers, working fine again. then it farted again.
BUH! im gunna return it i think. i bought a 3 year warranty when i got it