This simple android battery widget, shows the exact battery level and it also has some shortcuts to Power Summary, Display, Network, GPS, Wifi, BT Settings for an easy access to them. You have easy access to some important setting while easily checking the battery percentage.
Graphical Battery Widget shows the exact battery level in 1x1 space, with shortcuts to Power-Summary/Display/Network/GPS/Wifi/BT Settings
Updated with new settings design, also added Network settings and 'Show Desktop' feature - shows your wallpaper/live-wallpaper in full screen.
Note: This doesn't open, it is a Widget not an app. Add on homescreen with Menu -> Add -> Widgets -> Battery Widget or Apps -> Widgets -> Battery Widget
Description Permissions Usage by @BruceProgrammer (thx):
For quick access to the controls for turning Wi-Fi on and off, this application requires device permissions to view Wi-Fi state, change Wi-Fi state, and "prevent device from sleeping". This application does not, however, do anything to prevent the device from sleeping.
In order to display whether the GPS receiver is on or off, for display purposes only, this application requires the additional device permission to access "fine (GPS) location". This application, however, does not actually ever access device location information.
Open Source at http://code.google.com/p/batterywidget/