Bad@SS includes a notification bar widget that shows the battery percentage, however Bad@SS Battery Monitor is not only a battery indicator widget but also a tool that gives you an abundance of information of how your device consumes power. This knowledge can help you to tweak settings to improve the performance of your battery. It gives you information in the form of graphs and charts, and gives you battery output in percentages and minutes.
It shows you just exactly what is using your battery and how. It even gives you advice on what changes can be made to improve the battery life. One really neat thing that this app does is estimates the time left on your charge based on the amount of power left and the days consumption. You can set audible alarms to alert you when your battery is fully charged. There is also a social element to this app. You can share and compare your average battery life with others. Overall this is a pretty neat app, and can really aid you in improving your battery consumption!
More info and app download link here!