Ultra- Performance: 70C - 200C. With the Ultrea-Performance line from Swaytronic no limits are reached they are exceeded. Technology and performance: In addition to the high-quality manufacturing process of the Best-Performance, additional additives, which are mixed with the cell chemistry, ensure the maximum power density in the Ultra-Performance line. The internal resistances settle at an all-time low after just a few cycles - and provide more power than you need. Application : The focus of Ultra-Performance is on FPV drone racing, high performance jet models and 3D heli flying. But selected other areas are also covered. Ultra-Performance cells are used wherever all previously used cells were not power strong or stable enough, or reach the critical temperature range.