I don't use Auto-Brightness, especially when I at work for twelve hours. I keep it low, like at 20%. I use my 32GB touch like my 80GB at work and I can't even get ten hours. I would say I use it 60 (Music, Podcast) & 40 (Movies, TV Shows). Is it Defective? I looked at the Specs @ Apple, it claims I should get 22 hours of Music and 5 hours of Video.