It’s well established by now that decent battery life is hard to come by in this day and age, which is why it’s so important to balance satisfactory device usability with sound battery conservation. It wouldn’t make sense to sacrifice device usability for longer battery life, nor having an absolute power horse of a device that can’t last for more than an hour.
Battery Doctor may be the solution to finding the correct balance. Developed by XDA Senior Member ksmobile, who also created Clean Master, Battery Doctor delivers many useful functions and features with a logical and navigable interface. Clean Master grades your battery life and usage and optimizes the battery life accordingly through various settings modifications. Different modes can be toggled that aim to extend battery life to varying degrees, and customized modes can also be created with personalized settings. In addition to multiple profiles, schedules can also be set, toggling different modes at different times of the day, thus fully automating the process. Charging and battery consumption statistics are also presented, with the charging records even informing of days when charges are normal or excessive.
The most notable feature however, is its Screenlock Power Saving function. This function underclocks the CPU frequency to the very lowest when the screen is off, thus preventing unnecessary battery loss during periods when the phone is not in use. Naturally, only root-enabled users can activate Screenlock Power Saving. Other miscellaneous yet handy options include activating flying mode when the phone signal is less than 10%, and disabling WiFi and auto-syncing when Screenlock Power Saving is activated.
Battery Doctor is an excellent remedy for devices suffering from less than desirable battery life, packing various useful and practical features into a relatively light app. It is compatible with Android version 2.2 and above, and can be downloaded for free. If you would like to know more, check out the original thread for additional details._________