Building Cessna 421 Twin,will be using 2 hacker 40-10,2 castle 75 ESC, 2, 3300 mah battery one for each motor.Question is I want to us Fife 2100mah battery for the receiver.it is 6.6v,will that be to much or do I need a BEC to bring the voltage down.Also i have a 7 ch receiver,do i plug it into ch 7.the rest are full.Thanks
