Bonka HV-LiPo packs, These can be charged to 4.35v per a cell. They will hold their voltage up longer giving you all those extra RPM's you need to win the race!
Voltage: 15.2V (4.35v per cell 17.4cv Max)
Cell Count: 4S
Discharge Plug: XT-30
Dimensions: 20x30x60 (mm)
Continuous Discharge Current:40A(80.0A)