This is the Eflit 3S 11.1V - 3200mAh 20C Li-Polymer Battery with EC3 Connector. Eflit High-Power Lithium Polymer Batteries offer an lent blend of weight, power and performance. Available in a wide variety of capacities and voltages, there’s a battery perfect for almost any application from indoor slow flyer to large-scale sport and aerobatic airplane models, as well as micro to mid-sized helicopter models.