Tattu R-Line 1550mAh 95C 4S1P lipo battery pack 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 Toppilot batteries. It's also a subsidiary of the Tattu brand. It's got higher capacity, lower internal resistance and lower landing temperatures. They are remarkably more powerful than other graphene batteries. Generally, R-Line batteries have the same specs as our popular Toppilot 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.