I have an EZrun with 5400kV in my RC18B on a 2S lipo, it works well as is quick, the good thing about this is that you can upgrade to a 3S and keep the same 5400kV motor!
If you start with the 7800kV and a 2S will will probably not be able to upgrade to 3S as the motor RPM will be too high.
Just a thought!
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