I've been running the mezon bec with the 2s lipo without regulator through a switch to the rx. Haven't had any problems with this setup over 50 flights now.
so you have a separate 2 s lipo With a simpel switch Connected to the RX besides the bec from the Mezon?? and no regulator on the 2s pack?
as you read in my first post my consern is if I lost the Power from the motor battery in flight, With the Q80 we have "tryed" this several times and as long as the motor spinns you have Control when it stops ... radio is out but the OS gir motor I use now do not spinn by it self in the air at idle ..maybe if the ESC is out and brake is disabel ..havent tested that but its pretty hard to turn by hand