What is R-Line? R-Line is a brand new product line specifically designed for professional FPV racing competitions. It's the selling version of Top pilot batteries. It's also a subsidiary of the Tattu brand. It's got higher capacity, lower internal resistance and lower landing temperatures. They are more powerful than any graphine battery. Generally, R-Line batteries have the same specs as our popular Top pilot batteries. R-Line is currently in version 1.0. In the future different versions will also be rolled out to meet the needs of different FPV racing competitions. Here is: 1300mah 4s 1300mah 5s 6s 1300mah lipo 1550mah 4s Capatible with： Nemesis 240 Mini，Skylark M4-FPV250,Mini Shredder 200,INDY250 PLUS，HOVERSHIP MHQ2(270):,ZMR 250,Emax Nighthawk 250,Mini H,QAV250, QAV180/210, Danaus, Vortex 285, Mini H, FLIP FPV FRAME, droen and FPV etc.