Guys the reason your servos twitch after a fresh charge on a 6V battery is because the initial voltage after the charge is usually over 7 volts and this extra voltage causes the servos to twitch. Once you turn the radio on and start using some current when the volgage drops below 7Vs then the twitching goes away. What you do with a 6V battery is to get a voltage regulator (inexpensive, I think I paid 7.99 for mine), which plugs in between the switch harness and the receiver. The regulator keeps the current constant, no more twitching no matter what the charge and you get all the benefits of 6Vs!