Battery Widget is, as its name indicates, a widget that you can put on the desktop of your Android device. It will show you the exact percentage you have left on your battery.
From the application itself you can also deactivate some of the functions that use the most battery like the WiFi or the GPS. That way your battery can last a little longer.
Battery Widget is a good application for Android phones because it allows you to have a better control over the use of the battery.
