RE: Servo Voltage
The problem might be that when you think you have 6V battery, you might have more. If you use NiMH then it is for sure
lot more than 6V. NiCd batteries have quite stable 1.25V per cell while NiMH has its sells in fully charged status even
about 1.4V per cell i.e. 5x1.4 = 7V and that is something your system might not like. I am using a voltage stabilizer
circuit for 6V and 8(eight!) cells of NiMH in order to have 6V whole the time, even during very cold winter we have
when the temperature is lot below the freezing point. NiCd batteries are better and you might do well with 5 cells
but make sure that they are fully charged and then load them with small 5W car bulb for about couple minutes
prior you connect them to the Radio, becaue when fully charged they might have 1.3V per cell and some radios
and servos just do not "like" that. Why did I use NiMH ? - I got a lot of them almost for free and that is the only
good reason.