. When connected to a Mavic Air 2 charger or car charger the Mavic Air 2 Battery Charging Hub can be expanded to charge three additional batteries. It is designed for use with the Mavic Air 2 Intelligent Flight Battery. The battery charging hub enhances efficiency by charging batteries in sequence according to their remaining power level with more fully-charged batteries receiving power first. Top Features. Charge 3 batteries in sequence Compact & portable. What's in the box?. 1 x Charging Hub..