Greenify - Greenify is a mobile app that gives you greater control over your Android device's power usage, allowing you to get a lot more mileage out of your battery life without having to constantly plug it back into a charger.
coconutBattery - With coconutBattery you are always aware of your current battery health. It shows you live information about the battery in your Mac and iOS devices (iPhone, iPad)
SuperFreezZ - An Android app to completely stop all background activities of other apps.
Accubattery - Monitor's battery capacity through the use of science
Shelter - Isolate your Big Brother Apps
GSam Battery Monitor - Monitor your android devices battery usage.