FLY packs are specifically engineered for flight and help you pilot your favorite RC planes and helicopters to new heights. Produced using the best LiPo technology available, these packs are 5C fast charge capable, bred from racing heritage, and built for RC Airplanes and RC Helis. The patented UNI 2.0 plug system (patent no. 8,491,341) utilizes an Amass XT60 connector that easily attaches to the included Deans and EC3 adapters. RC pilots, get ready for a long flight.