The full name of BEC is Battery Elimination Circuit, which means battery elimination circuit in Chinese.
UBEC's full name is Ultra Battery Elimination Circuit, which separates the built-in BEC circuit from the electronic speed regulator and becomes a separate electronic device and provides greater output power, so it is generally called an external BEC.
UBEC is mainly used in two situations: with heavy loads; and when the input main voltage exceeds the allowable range of the onboard BEC.
UBEC uses digital DC-DC conversion technology, which has high conversion efficiency, small size and strong load capacity. An external BEC is required only when the ESC output voltage is high or the ESC output voltage cannot reach the voltage and current required by the servo.
Battery removal circuits were originally used in situations where commercial power was converted into battery power. Nowadays, they are mostly used in battery-driven situations that require high or low power, which can be used to save battery requirements. For example, when the motor requires 12V and the control board requires 5V, a set of 12V to 5V battery removal circuit is needed, and only one set of 12V batteries is needed.