5BK-3HCCAW : 6.0 volt 2550mAh eneloop pro RC receiver battery
Amazon.com: Tenergy NiMH Receiver RX Battery with Hitec Connectors 6V 2000mAh High Capacity Rechargeable Battery Pack for RC Airplanes/RC Aircrafts and More : Toys & Games
Amazon.com: Tenergy 6V 1600mAh Rechargeable Side by Side Hump Battery Pack, NiMH Receiver Battery Pack with Hitec Connector for RC Trucks, RC Cars, and RC Hobby Electronics : Health & Household