The DJI Mini 4 Pro/Mini 3 Series Two-Way Charging Hub can be used as a charging device or a power bank. Follow the steps below to best use the Charging Hub as you require:

1. Charging Intelligent Flight Batteries: Insert the battery into the port until it clicks, then connect the hub to a power outlet. The battery with the highest power level charges first, followed by the others in sequence. Remove the battery from the hub once fully charged, indicated by solid green LEDs.

2. Using Batteries as Power Banks: Insert the battery into the hub without connecting it to a power source. Connect an external device to the USB port to charge it. The battery with the lowest power level discharges first, and the status LEDs will show the power level of the battery in use.