ARRIS 4s Lipo Battery Pack for FPV 250 RC Quadcopter, Such as Eachine 250, Kingkong 250, etc. The ARRIS battery is the best battery we`ve tested. Not one of the best, but best for sure. There are some other brands which sell very cheap batteries. We can not believe the quality. We only sell batteries that have quality guarantee. Don`t save money on battery. Safety is the most important thing to all the fliers. This 4S 14.8V 1500mah 50C lipo battery is specially designed for FPV racer. For ARRIS 4S 1500mah lipo battery, we have done UN38.3 test,1.2M Drop test,MDS report. Click this link to check these reports: http://blog.arrishobby.com/2017/02/20/arris-4s-1500mah-50c-battery-test-report/