RE: Difference between 4.8v and 6.0v?
I just bought a Spektrum DX7 just this year. They now package a 4.8v 1100mAh NiCd 4 cell battery with 4 high torque digital servos.
I heard they had trouble in the past and they made some changes since then.
They now claim an input voltage range of 3.5 - 9.6v.
TW