How do I charge the Xiaomi Solar Outdoor Camera BW400 Pro?

When the camera needs to be charged, it will send an alert notification of insufficient battery level through the Mi Home/ Xiaomi Home app.
Charging Method 1: USB charger
5V/2A or 5V/1A USB chargers can be used to charge the camera.
It takes about 8 hours (at 5V/2A) or 18 hours (at 5V/1A) to fully charge the camera from 0% to 100%.
Charging Method 2: Solar charging
The camera has a built-in solar panel on the top, which allows it to be continuously charged as long as it receives at least two hours of direct sunlight each day. There is no need to manually connect it to a power cord for charging.
Note: 
The position of the camera will affect solar charging efficiency. It is strongly recommended to refer to the installation recommendations in the camera settings.