That is generally the case but my size up heli is a Gaui 550 which uses 2 x 11.v 3S1P batteries which is what I use in the Blade. Flight times are limited onthe 2200mAh batteries I have however... and 20C are not quite up to the task... you would want at least 30C or higher.

Essentially what I am saying is that I use my 6 x 2200mA Zippys that I use in my Blade 400 to fly my Gaui 550 for 3 flights.

Just a point to consider.