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ob nut: this is the battary pack
http://www.futaba-rc.com/batteries/futm1290-b.jpg I was just going to make up the battary back with 4 AA battaries , that would come out to about 6 vdc.I just want to know if the Receiver would handle the 6 volts.Well then I guess that the servos would also get 6 volts.
Most servos will take 6 volts and are to designed to work with it improving the torque. Not sure if you are making a pack from dry cells or what???? They are 1.5 volts X 4 would be six volts but you gonna make a new pack everytime they die. If using rechargeable NiCd or NiMh they are only 1.2 volt and you need 5 actually to get six volts.