OPG is a kernel-level power-saving app and reduces 70%~80% battery consumption

One Power Guard is a unique battery enhancement tool designed to conserve your battery power an increase uptime on rooted Android smartphones/tablets. One Power Guard will decrease your charging time and increase your device performance while also increasing your uptime. One Power Guard will also protect your device from faulty applications that can: cause over-heating (decreasing your battery lifespan); run down your battery; prevent your device from deep-sleeping; and use unneeded resources such as WiFi and Cell Data. By selecting any one of the six customized power-saving modes you are able to match your power savings needs to your lifestyle. There is no need to purchase extra batterys or a larger battery just use One Power Guard.

Cloud Stats: http://www.opgpro.com/cloud/
Blog: http://onexuan.com/blog/
XDA Post http://forum.xda-developers.com/showthread.php?t=1947559

Features
1. Extends stand-by time and battery life; optimizes charging parameters
2. Optimizes system kernel and CPU usage to improve device performance
3. Six (6) customized power-saving modes to suit different scenarios
4. Proactively guards from power-killer apps and safely shuts down useless power-consuming programs
5. Fast ON/OFF settings for 100% system customization
6. Intelligently switches to/from WiFi/Cell data to preserve battery life
7. Professional Tips on power optimization