Battery guard is free app . It can help you save battery power at the touch of a button. With its many features, including power consumption ranking, memory scrubbing and background task shut-down, you can easily change the battery saving mode and extend battery life.
1.Saves battery power (includes battery optimization/memory scrubbing/task killer)
2.Secure charging (provides monitoring reminders for battery charging)
Remaining charging time is clearly shown.
3. Power-saving mode (custom mode/super power-saving mode)