RE: Battery use info
I use LiFe packs (6.6V) without a regulator with a mixture of Hitec 225's, JR 3021's (yep, still have a handful), Futaba 9650's, and Spektrum H5000's. Toss in a couple Hitec 82 or 85MG's for throttle..
So far I've not had troubles with the 6.6V battery on the servos, without resorting to special high voltage servos or a regulator.
I have flown 2S LiPo with regulators, though - but am switching everything over to the Life batteries with no regulators.