KCRTEK 550mAh Lipo Battery, 2pcs 3.7V 550mah Battery with XH Plug for RC Quadcopter Holy Stone MJX X400 X 400W X800 X 300C Sky Viper S670 V950hd V950str HS200W and other Quadcopter Drone KCRTEK Professional Replacement Lipo battery,High safety Grade A lithium polyer raw material. Quickly Recharged,Long cycle life with 150 times minimum. Parameter,3.7V 550mAh;Weight:0.031lb;Dimension:2.76*0.98*1.58inch;Connector:XH Plug Applications,Compatible with most Micro RC Helicopter & Airplane 1S Batteries:Syma X1, X4, X5C,X5, X5C, X5SC, X5SW X11, X11C; Cheerson CX-30W; UDI U815, U816A, U818A; Wltoys V929, V949, V959; MJX T04, T05, F28, F29; Hubsan H111, H107L, H107C, H107C-HD, H107D and more What you get,1pc KCRTEK Lipo battery&180days free return and custom service based on your require.