HEBF (empty heart, full battery)
What is HEBF:
HEBF Optimizer is an application that aims to increase the performance of your device, also by focusing on battery performance, we didn't forget it. With a clean, fresh and pleasant user interface, HEBF shows you the explanation of each option right below it. The application also features an useful and smart root toolbox that you can use whenever you want.
▪ Root access is no longer a requeriment!
▪ Busybox installed (if rooted)
▪ Android 4.1+
*Several operations may not be available in rootless mode*
Why do we need access to storage?
We need to copy some necessary files for the application to work, read them and then run them, for that, we need this permission.
(Root) Why do we need busybox?
Busybox assures us that all commands will run on all versions of the Android system, it is a binary that gathers the most common binaries into a single one, so if one of them is missing on your system, it will be present in busybox.
At the XDA Thread: http://forum.xda-developers.com/android/software-hacking/hebf-tweaking-battery-saver-optimizer-t3401341