Amazon.com: Smatree Battery Charging Hub Compatible for DJI Phantom 4/4 Pro/ 4 Pro V2.0/4 Adv(Charge 3 Batteries One by One, Converting Phantom 4 Battery into Power Bank, Not Include Power Cable ) :
DJI Phantom 4 Series - Battery Charging Hub user manual (English - 56 pages)
DJI Phantom 4 Series Battery - Shop Online at Map Gear
Amazon.com: DJI Phantom 4 Series - Battery Charging Hub(for DJI Phantom 4/Phantom 4 Pro./Phantom 4 Adv.) : Toys & Games