With the DJI Mavic AIR Battery Charging Hub, you can charge up to 4 Mavic AIR Intelligent Flight batteries at the same time. Connect the hub with a normal charger or car charger to your socket or your car's 12V input. All your batteries will be charged in about 3.5 hours. The battery that's the least empty will be charged first. This way, you'll have a fully charged battery as quickly as possible.
Note: this hub does not include a charger.