MiniAviation 300 mAh, 30C, 2S1P UMX Style Li-Po Battery Pack The Miniaviation 300mAh 30C battery offer more power and capacity than the the standard batteries available for these aircraft. These packs are assembled from 2 of our highly regarded MCPx high power helicopter cells.They feature the correct UMX style conector and use high quality flexible silicone cable. Suitable for use with : Mig 15 Beast Beast 3D Gee Bee R2 Hyper Taxi Carbon Cub Sbach 342 Parkzone Stryker 180 aircraft. Blade 130X