I thought I had a defective batter as well, but I was wrong. I have been using the ipod throughout the day, starting in the Am with a full charge. At the end of the day, using it on and off, it would be about 20% or less. My thought was that I was probably only using it maybe 6 or 7 hours a day and that this is not what apple advertised. So I thought Id put it to the test. I was thinking that because I was changing albums by hand (using the LCD), checking song names occasionally, maybe using the lcd was a problem and draining the battery. So I looped a playlist and plugged it into my headphones and didn't touch it except for a couple times to quickly check the batter meter. It Gave up and quit at 16 hours. I thought for sure that I had a defective unit as thats 8 hours short of the 24 hours claimed. After reading an apple doc on how to extend battery life on Ipods, It mentioned that Turning off the EQ would extend the batter life. I also had another thought. The headphones I use are more DJ style and much larger. perhaps it takes more battery life to drive these things. So I Plugged in the Stock Apple Headphones and hit the reset button on the Ipod, which turned off the EQ and put the Ipod back to factory spec. After a re-run of the test, I got 31 hours and 15 minutes. This is a huge difference. So I guess My ipod is OK,and learned that the headphones I use, the abundant use of the interface screen, and using an EQ setting has a huge impact on batter life. Now I know, Hope this helps.