Thank you for reply. Your servos requires 2,5 A per each. So 2,5 x 8 servos=20A. I think you should use LiPo 7,4V battery that can deliver 20A or more. I think you can plug to the LiPo eight 5V 3A UBECs, each one to power one servo. And have you got an idea to power from the same power supply the RP...