MetalMan, if you're getting 15 minutes of runtime on your 7XL setup, I should be able to get more with my 9XL track setup. I'm still waiting for my Quark to get back from S&T. I've been toying with the idea of running 6S2P A123s with a 10XL. I'm just a bit concerned about the weight and the way it will affect the way my truck flies.

I've thought about getting the Dewalt packs and breaking them down, but my LHS is cutting me a deal that makes it worth it to me to just get the cells with the solder tabs on them. I just really don't want to have to deal with all of the welded joints on the dewalt cells. I'm going to go read your thread on the subject again. I may change my mind.

Thanks for all of the info.