A battery eliminator circuit (BEC) is an electronic circuit designed to deliver electrical power to other circuitry without the need for multiple batteries.

This UBEC is an external switching mode DC-DC regulator; it draws DC voltage from 2-6S LiPo battery, drops it to a voltage level that is suitable for your receivers and other electronic devices, and keeps providing the stable current output of up to 10Amp. As the UBEC has such a powerful output capability, so it’s particularly applicable for large helicopters and fixed-wing aircraft.