Battery Monitor Widget is a good battery widget for android from the developer 3c. The application will monitor the battery and provide data on the following items: capacitance, charge / discharge (mA and mW), voltage, temperature. Also you can view the history and scrolling or scalable graphics, there is the ability to configure the alarm and calibrate the battery. It should be noted that the application itself consumes very little of the charge.
All version of Battery Monitor Widget