RE: Futaba 3305 servos
That is a Futaba standard warning meant to ensure that you understand that these servos need a good power supply. If your NiMHs are good quality cells with a low internal impedance you will be fine. However, if you have cells with a higher internal impedance (over 8 to 10 milliohms per cell) you may have issues with voltage drop under load, especially if you are using 4-cell packs.