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Yes, the max volt for servos is 6V. so BEC is required to supply 5 ~ 6V

"Hobbyking YEP 20A HV (2~12S) SBEC w/Selectable Voltage Output" is used.
https://hobbyking.com/en_us/hobbyking-yep-20a-hv-2-12s-sbec-w-selectable-voltage-output.html