I just re-read the original post and the 16/15/2 is a pretty hot motor. I'd be careful with that eFlite 35 regardless of what battery you go with. I'm using the same motor in a Wemotec fan unit and they pull up to 45A. Any idea what the draw is with that propeller your using?

Just thought of one other thing: If you do bungee launch it, make sure you hold some up elevator before release or its going to be a short flight. <g>