... linearity ESC 85A,70A,60A,50A,40A,30A,20A,12A,8A brushless speed controllerfor HelicopterWires Connection: Always use new connectors, which ... \ 2-6 Lipo305.5V / 4A23 x 52 x 7yes50A BEC50A70A5-12 NC \ 2-4 Lipo305V / 3A23 x 52 x 7yes50A SBEC50A70A5 ... PACKAGE ESC 85A,70A,60A,50A,40A,30A,20A,12A,8A brushless speed controller