Kyocera Power Management
A proprietary preloaded power management app on some Japanese phones from Kyocera that takes care of your phone’s battery. Using this app, your phone will go into low power mode by adjusting various functions that might be on, like timeout, brightness etc, which is a good thing as you can lose lots of standby time with these things left on.
You kinda can’t use it on any other phones, but take a look at their selection of devices. I think we should take a closer look because they have some potentially really green devices.