alternative power sources

[cdog4w]

What do you use to power your mini-x? I was looking into making my own pack and was checking out all of the different size batteries available.

So far, I've read about li-poly (too expensive for me right now), someone is running 5 2/3A cells... you get the idea.

I was considering 6 1/3AA cells for 7.2V, but they're only 280mAh and I'm not sure of the internal resistance. Aside from shorter run time, does anyone know how well this would power the X? The place I saw them was selling a 12 pack of tabbed 1/3AA for $16, which would make 2 of these packs.