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.
Shelter - Isolate your Big Brother Apps
Accubattery - Monitor's battery capacity through the use of science
island - a free and opensource alternative to parellel space
Power Battery - Power Battery, as the most professional battery saver app, could get up about 60% more battery life for Android phones or tablets.
App Cloner - Clone your Android apps so you can use multiple logins.