Futaba servos have an ear on them that lines up the slot on the receiver. You can use Hitech with Futaba, but they do not have the ears so you need to make sure they are plugged into the receiver correctly. As for batteries, you can use most any brand for the receiver, just make sure that the polarity lines up correctly. If you switch over to 6 volt you need to make sure that whatever servo's you select can handle 6 volt and some of the higher torque servo's need need a certain type of battery. Good Luck, Dave