ORIGINAL: FHHuber
You can go to Wal-Mart, get 8 AA NiMH cells (1800 mah) for appx $18... and solder up a TX pack if you want to play with soldering on a battery. (it works well... but you HAVE to know what you are doing to get good joints!) I am right now operating my TX and RX on battery packs made this way... but I have a friend who is VERY good at soldering up battery packs and does a professional quality job of it. (I don't trust my solder joints on batteries.... and I do pretty well at soldering... Think about it.)
FHHuber - What brand name battery are you buying at Wal-Mart? Sounds like a very good price for NiMH's.