Has anyone tried this? I thought it would be a nice upgrade, im not into sport flying, i enjoy hovering and flying around a field so the lower voltage is fine for me. 4 1125MAH A123 cells is 6.8 oz, a stock eflite 1800mah battery is 6.6 oz so im thinking the weight wouldnt be an issue. I like the idea that you dont have to baby them, and charge them at a very fast rate (10-15 minutes). Has anyone tried this on a 450 size heli?