Combo: 3pcs of Tenergy 3.7V 380mAh LiPO Battery for Hubsan X4 (H107C, H107D, H107L) & TDR Spider Quad Copters It will give more PUNCH and ROBUST performance due to its higher current output and power. Batteries are direct replacement - Compatible with these Hubsan models: Hubsan X4 (H107C-HD), Hubsan X4 (H107C), Hubsan X4 (H107D), Hubsan X4 (H107L), Syma X11, Syma X11C, Syma X51, TDR Spider, XT Flyer, WLtoys V252, JXD JXD385, Walkera Super CP, Walkera Mini CP, Walkera Genius CP -- no modification needed! Dimensions (Max.): 40 x 21 x 7.5mm Capacity: 380mAh Voltage: 3.7V