Xcsource 4pcs Upgraded 3.7V 350mAh LiPo Battery for RC Quadcopter Hubsan X4/H107d, UDI, Syma X3, Cheerson CX-6057 RC219 Good product with high quality material. Fine workmanship and perfect style. Easy to install and convenient to use. With stable performance, it is practical and durable. Fashionable design, match with your quadcopter perfectly. It can help your quadcopter fly much higher and quicker, more secure. Suitable for: MJ 102, Hubsan X4/H107d, UDI, Syma X3, Cheerson CX-6057.