Conrad Energy Lithium Polymer Battery 3.7V/1000mAh (10C) with BEC ...

Conrad-Energy-10C-LiPo-Batteries-with-BEC-Connector-Conrad-Energy-209254-p-A-Lithium-Polymer-LiPo-flight-battery-with-a-10C-maximum-safe-continuous-discharge-rate-p-Conrad-Energy-Lithium-Polymer-Battery-3-7V-1000mAh-10C-with-BEC-Connector

Price: 12.94 from Rapid Online Rapid Electronics Ltd.