are you using a seperate lipo to power receiver ?
I am assuming in a cougar SV your running an ESC to power motor, which "steps down" the voltage from main lipo to an accepatable voltage to supply receiver
if thats the case its fine if you use a sepearte "7.4v rx lipo" you need to make sure rx is capable of 7.4v aswell as servo or you may run into trouble longterm
regards dave
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