From Derek Clark:
What to know how much time you have left to play that game? Look no further than Battery Check! Battery Check is a simple app that shows you how much battery life you have left on your phone. It also gives stats on how much time you have left for certain activities including: -3D Gaming -Video -Music -Phone -3G Internet -Wifi Internet What people are saying about Battery Check!: "A very simple and helpful tool to check your battery info!" "Recommended, very good and well polished app!" "Nice app, it does what it is supposed to do, providing an estimated time of usage left." "Gives solid information to gauge your battery usage. Nice app!" "Very good app for measure the battery of your device, highly recommend it guys, get it!" "This app is great if you a battery-saving fanatic! 5/5 and keep the updates coming!" Please note the percentage in the status bar is not from this app. That is a setting on the iPhone 3Gs and newer phones.