Do some research and try to figure out what your maximum current draw will be. Running on only 2S with the 5700 may draw more current than the truerc cell can handle. I don't know, that's why I'm saying you'll have to try to find out. To be safe, you might want to try the maxamps 5Ah or 8Ah packs. They are rated to over 100A constant draw, whereas the truerc is only rated to 80. On the other hand, truerc reputedly under rates his cells.

All I know is that the 5S 8Ah pack that I run in my 13lb muggy never breaks a sweat; but I am running 5S with a milder motor (8XL).