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) : Toys
Battery flashing 1st LED,not charging. | DJI FORUM
Phantom Battery Won't Charge - LED blinks 3 times | DJI Phantom Drone Forum