Review on Vivefox Xbox Controller Charger with Rechargeable Battery Packs – Compatible with Xbox One/One X/One S/Xbox One Elite Wireless Controllers, Includes 2 x 1200mAh Batteries by Christopher Tillman

Much more convenient to just use USB to charge my controllers, wish there was an option for 4 but that's enough for now. Since the dock has a controller station, I keep forgetting where I leave the controller and spend at least 10 minutes looking for it. Doc discreet, helpful