Amazing how much mis-information there is out there, lol.
I personally won't do it any other way. Like Barracuda, I use a single 2300mah A123 that goes into a super switch on one lead (the super switch has two power leads that both go into the reciver if you wish) and the ignition for the other. A third lead is a charge lead. On the ignition side I use an optical kill switch and a simple volatage reducer. All products can be had from WrongwayRC...Rich is a great guy too.
I currently have this set up on a 71" SLick with 40 plus flights and it works flawlessly. The beauty of the A123 is you fly it a few times, hook the charger up to it and its done in about 7 minutes. No range issues, no interference issues, fly all day. (I use Spektrum 2.4).<br type="_moz" />