I was told each spot u plug a servo in can handle 3 amps, plugging a battery in at the hub would prevent the servos from pulling to many amps from your receiver causing a possible lockout. In my large 100 cc plane I had one battery just for the receiver and another large pack that was isolated fromt he receiver to prevent voltage drop. The problem with Futaba is one there lack of instructions for the products and two lack of detailed info on new products. I still love my 14mz just took hours of playing to figure it out the book was useless.