This sounds really stupid on my part, but when I first got my 1st generation Ipod touch, I didn't know how to turn it off completely and it would be on all day playing music in my bag or whatever. I learned later on that you need to keep holding the top button down for a few seconds and you'll get a screen that says slide to power off. Now the battery can last me a few days when fully charged. I doubt this happened to you, but I never read instructions, so that may explain my ignorance. Also, if you have a warranty I say go for it, you have nothing to loose.