[paulj]

Thanks for all the info guys.
I'm thinking of 2 differt setups.
First is my L39. I'll be using 2x4s (approx 10000mAh) batteries to power the
Stumax EDF.
Don't want to take any of that power and use for servos thus my question of
separate battery. I'll be running at least 8 digital servos plus navigation lights etc.

Second setup will be dual 70mm edf's each with their own escs and 4s batteries.
I expect it too will be running approx 6 servos and lighting system.
Again I would rather keep the motor batteries just for them and nothing else.

I'm only in the planning stage at the moment and looking for some possible solutions.