I was thinking of using the 2 in 1 but it too is limited to 9.6 volts. I don't believe the stock Walkera limits battery voltage to the motors. I read that the e-flite 4 in 1 is compatible with the 2S and 3S LiPos. What I'm, looking for is the getting the full potential out of my 3S. Lots of power at the cost of some tail motors every so often. [8D]