the mme's power consumption is 5.5W
I = P/V
5.5W/9.6V = 0.572A = 572mA
( Battery Capacity [mAH] / Current Draw [mA] ) * ( .80 )
3000mA / 572mA = 5.24h * 0.8 = 4.2 hours
this was the formula i used for the 9.6v pack and the 3000mah pack, just substitute what your using and you are good!
im not sure how much not using phantom makes for runtime, but this will give you a minimum runtime to go by