This report is from XDA, you can see the Official reports from here
Since the beginning of Android, hardware changes have been easy to notice. Quad- and octa-core devices are nothing unusual now, and RAM and storage capacities make phones as powerful as some traditional PCs in certain respects. Unfortunately, they all have one major weakness: battery life. Even the biggest batteries still last a day or two of intensive use on phones and maybe few days on tablets.
Aftermarket kernel improvements can save a bit more of battery, which is a good beginning. Luckily, XDA Senior Member onexuan wrote an application to optimize battery usage in many ways. OnePowerGuard Pro gives users a chance to conserve the battery in six predefined modes, which turn on or off selected services depending on day time, usage, or other personal preferences.
Onexuan states that his application tweaks the phone on kernel-level and optimizes many of factors that can cause battery drain for an overall reduction of 70-80%. Naturally, the app requires your phone or tablet to be rooted. It’s easy to say that something does wonders, but the best way to verify it is trying.
If your battery seems to let you down, you may want to give OnePowerGuard Pro a shot by visiting the application thread for additional details.