I'm having the same problem with the white iPod touch 4th Gen it drains very quick, its awful. Even my 2nd Gens battery lasts more ffs. iOS5 is the reason I'm %100 sure and apparently the iOS 5.0.1 fixed it for the iPhone users but not iPod Touch 4G? Not to mention the 4th Gen works slower than before now because of iOS 5 as well. Apple slacking again. Pathetic