1.The camera's LED will flash red (for three times) when the battery is being charged, and the app camera settings menu will show battery percent.
2.Plesae try to use the USB cable in the original package and connect to a 5V2A, 5V1A USB charger. Or please try to connect the camera to the USB port on the back of the hub.
3.Please make sure the camera's ambient temperature is between 32°F (0°C) - 122°F (50°C) during charging. Otherwise, the cattery cannot be charged.