Hi, I have the new iPad, and as many many others I am having real issues with the battery life on the new iPad. I am between 4 and 6 hours when using it to see a film, be on Kindle, and perhaps playing Angry Birds. How do I know when I have a technical issue with the iPad, and that I should take it back to Apple? Or is the above normal behavior? There must be some sort of guideline that someone can tell me? Thanks!