Amazon.com: Hanatora 4 in 1 Rapid Multi Battery Charger with Ground for DJI Phantom 4/4 Advanced/4 Pro V2.0/4 Pro Plus Obsidian Drone&Remote Controller,Parallel Charging hub for Phantom 4 Series : Toys & Games
DJI Spark battery won't charge. | DJI FORUM
11 Common Phantom 4 Battery Errors & Charging Problems - Let Us Drone
11 Common Phantom 4 Battery Errors & Charging Problems - Let Us Drone
Battery not charging | DJI Phantom Drone Forum
P4 Batteries dead after long term storage | DJI FORUM