This practical charging accessory can hold and power three batteries in sequence. Take it with you to charge your remote controller, smartphone, or other devices when a top-up is needed.When used with a Usb charger, the Dji Mini 3/Mini 4 Pro Two-Way Charging Hub can charge up to three Intelligent Flight Batteries Plus in sequence from high to low power level. When used with the Dji 30W Usb-c Charger, the charging hub can fully charge one Intelligent Flight Battery Plus in approximately 78 minutes.When the charging hub is connected to Ac power through a Usb charger, users can connect both the Intelligent Flight Batteries and an external device (such as a remote controller or smart phone) to the hub to charge. The batteries will be charged before the external device by default.