GO Battery Saver & Power Widget is the one of the best in available on play store .
you can adjucts with somany modes power saving mode, smart saving, toggle control, power testing, etc
Main Features
- Accurately estimates battery remaining time
- Widget that improves battery performance with personalized UI design
- Indicates how much battery power will be extended if you shut down WiFi, Bluetooth,etc
- Battery consumption optimization in just one click
- Smart battery save
- Charging Maintenance to help keep the charging process safe and healthy
