Clean fatshark battery case mod, adds the third wire for the balance connector for charging without removing the cells :) : r/fpv
Amazon.com: Fat Shark 18650 Battery Case Holder with 4 FT Power Cord Use for DJI FPV Goggles, FatShark HDO2 and Attitude Headset (Battery Not Included) : Electronics
FPV Goggles Battery Connector Mod - Power Adapters - Oscar Liang
Amazon.com: Fat Shark 18650 Battery Case Holder with 4 FT Power Cord Use for DJI FPV Goggles, FatShark HDO2 and Attitude Headset (Battery Not Included) : Electronics