Huawei Mate 8 - Manual (Page 171)

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Power management
Monitoring your power usage
If your phone's battery life is too short, use Phone Manager to find out how you can save
power.
1
Open Phone Manager.
2
Touch Battery manager > Optimize. Your phone will check for power consumption
problems and automatically optimize performance.
To further reduce power consumption, refer to Optimizable issues. Select View or
Optimize to adjust the power settings manually.
3
Touch Finish to exit.
Viewing power usage
Phone Manager lets you rapidly identify and close apps which are draining your phone's
battery.
Remaining battery percentage
More power saving settings
Touch to view detailed battery
usage statistics