My battery has been acting pretty weird lately. Yesterday, it died on me completely battery drained to zero when it said it still had 80% left. So today I made some battery saving changes (the usual suspects) and get it fully charged for the day. This afternoon it says that it had 40% battery left with only 30min usage and around 8hrs standby. I play around with it some more turning it off and back on and resetting it and it tells me that I'm back up to 70% battery. What are normal usage times vs standby. I swear that I got more usage from my old iPhone 3G then what I'm getting with the 3GS!