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Tattu 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 more powerful than any graphene battery. Generally, R-Line batteries have the same specs as our popular Toppilot batteries. There are different R-Line versions for the needs of different FPV racing competitions