Parallel Charging Board with XT30/XT60 Plugs - Simultaneous Multi-Lipo Battery Charger for 2-6S Packs, Compatible with Balance Chargers

It looks like it's working, but they make them with XT30/60 connectors so you don't have to use adaptors https://www.amazon.com/Lithium-Batteries-Balanced-Charging-Parallel/dp/B0B1HLK1Q6