3.7V 702030 20C 300mAh Helicopter Li-Polymer RC High Rate Battery for Quadcopter | eBay
Amazon.com: HAWK'S WORK 3.7V 300 mAh Lipo Battery, 1S 20C Lithium Battery with USB Charging Cable for Toys RC Plane Truck Boat Quadcopter Helicopter Drone (A) : Toys & Games