Accubattery - Monitor's battery capacity through the use of science

DU Battery Saver - DU Battery Saver, get up to 50% more battery life for your Android phone. Battery Saver learns how you use your phone, then creates smart profiles that match your settings to your needs while getting more life from your battery.

GSam Battery Monitor - Monitor your android devices battery usage.

Battery Saver - Battery Saver is a perfect tool for those smartphone users who always remain worried about the health of their phone’s battery.

BatteryBot Pro - Shows your battery charge level (percent) as an icon in your status bar, with temperature, health...

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.