Be aware, EMF can still be an issue. I've watched a Ziroli P-51 go from 100 foot to 0 foot in a few seconds. THe interference caused by the elecronic ignition did in fact mess with the 2.4 GHz radio installed.

Now mind you I'm not sure that the ESC to battery & motor connections could cause that type of EMF, but I've seen bad things happen.