User manual

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Power Usage
Go to "Settings" > "Battery" > "Phone battery usage".
You can view power usage of today, yesterday and 2 days ago. You can also
view apps' foreground and background activity time, and their power
consumption.
Power Saver Options
Go to "Settings" > "Battery" > "Power Saving mode".
High Performance Mode
Go to "Settings" > "Battery" > "High Performance Mode".
The system will operate in high performance mode, but it will increase extra
power consumption.