on button 3s
to enter S1
7.9. Charging the Device
7.9.1. Connect the original power
adapter(5V/2A) with USB cable for charging.
7.9.2. When charging, the white indicator of
the power key will flash; when fully
charged, the green indicator of the power
key will be normally on.
7.10. Checking the battery
In the power-on state, short press the power key
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