Unplugged as normal in the morning, normal days worth of activity which for me is pretty average. After work used 1.5hrs of GPS. Decent drain, but not horrible. Then went to a concert. Phone is in pocket started getting warm. Turns out, in the building cell reception was spotty, and was on 1X data. Must have been trying to do some syncing or data transfer and kept the radio working. Dropped a full 40%+ in fours hours there. At 15% turned on airplane mode and it stopped draining the battery. With that 15% remaining i was still able to run the GPS on the way home. I had a car charger, but just wanted to see how much I could push it. That cell standby will get you every time.