Overview of the DJI Air 3 Battery Charging Hub Optimize your flight preparation with the DJI Air 3 Battery Charging Hub. The hub can fast-charge up to three intelligent flight batteries in sequence, as well as additional accessories, such as a remote controller and smartphone. It also features a convenient power transfer ability, which lets you offload the charge of partially-filled batteries to the battery with the most power, giving you an extra flight when charging is unavailable. Features of the DJI Air 3 Battery Charging Hub For DJI Air 3 Flight Batteries Charge up to 3 Batteries in Sequence Power Transfer for an Extra Flight Charge a Remote or Smartphone For more DJI Products see here.