just for your information, those apps don't work on Android. they make you feel better by displaying how they're cleaning memory and such, but the truth is that killing processes on Android doesn't improve performance or battery life, and can actually worsen it (if an app is killed before it finished doing a task, it will restart and start the task from the beginning, so the CPU load is increased for longer).
@najodleglejszy
Thanks for the information,I Know what you mean ,and yes there are a lot of power saving app like you said . But this one "brevent" it's really working without root ,try it out, especially on sony phones. I do not know the principles,but it needs you ADB some command goes in the phone authorize this app like root,then it will working together with system battery optimization, also stop APP linkage self-starting. These ADB command will fail after reboot, need ADB again.
Because there are many china commonly used APP will be spread in the background and linkage self-starting to eat you battery ugly. So all brand of phones china firmware will have the system comes with the official background APP start control ,except sony,only sony. For guys use other region of firmware or can't root your phone like sony they all using this brevent APP, very famous in our region. At least 10% can be saved in a day ,based on the number of your background APP,some times save more.
https://play.google.com/store/apps/details?id=me.piebridge.brevent&hl=en
