Geamazon 2pcs JXD509G 509W Quadcopter 850mAh lithium battery with charging protection board 1.100% Brand new,high quality with best price. 2.Fit for JXD 509G 509W RC Quadcopter. 3.Easy to install and durable to use. 4.Battery: High capacity, enjoying much longer fly. 5.Package include: 4PCS Propellers+ 2PCS 3.7V 850HAM lithium battery