The jittery is normal and will go away after the batteries begin to drain. Not sure, but I was told that this is because the voltage, 6 volt 5 cell pack, is right up where the receiver is saturated but deminishes real fast after hookup. I use 6 volt 5 cells on just about everything but my small aircraft. More torque and faster response. I also use larger size batteries, two 1500 mah NiMH's in one of my planes, my Venus II. Others have one large 6 volt pack.

DS