This is a Kinexsis F-Tek 3S 11.1V 5000mAh 40C LiPo battery with an EC3 plug and LED charge indicator. The new F-TEK LiPo battery series from Kinexsis has a 40C discharge rate. This series of batteries provides exceptional punch for a great price. All batteries can be charged up to 3C. In addition, the 40C F-TEK batteries have an LED display that indicates the filling status of the battery at the touch of a button.