Really heavy, and underpowered. With the APC 12X6 and 13X4 props you will draw about 70A WOT. 3300X20C=66A, You want the constant rating on the battery to at least match the current draw, however using an even higher discharge lipo will keep the batteries cooler, and can pick up an amp or two and up to 50w more just by switching the battery. Once the discharge gets above 50% higher than the draw there is no real benefit, for 70A, that would be 105A, that would be a 2650mah 40C, or 3,000mah 35C. For 3D, something lighter, prefferably under 300g is better, the 2650mah 35C nanotechs put out 92A, and weight just under 300g, probably the best mix of weight and flight duration for 3D. Some have been using 40 and 45C 2200mah batteries, they can come in around 250g, and can get a tailheavy CG if desired for 3D, although flight times will be short. If you mostly fly conventional aerobatics or pattern, a 3,000mah 30C might be better, the weight isn't as much of an issue, and can actually be beneficial to some degree in the wind. Problem is once you get near 350mah, you need to cut the bay deeper to get a neutral CG, A 300g LiPo pushed all the way back is about neutral.