My dad upgraded his 3GS to iOS4 the other day and now his battery life is horrible. He claims it only last half a day with moderate use. I also have a 3GS and haven't noticed too big of a hit. Is anyone else having similar problems? He's pretty mad and of course he a few days outside of apple care. He's not able to get the iPhone 4 subsidized and won't pay the early upgrade fee. I've suggest a battery pack but he still finds it absurd. Any help is appreciated.