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What is a BEC and what is it for?

A BEC (Battery Eliminator Circuit) is an electronic circuit that supplies the receiver, servos, and any accessories in your RC model with the correct voltage. Thanks to the BEC, you no longer need a separate receiver battery: the electronics are powered directly from the main battery.

What does a BEC do?

  • Voltage conversion —converts the higher battery voltage (e.g., 7.4–22.2 V LiPo) to a stable 5–6 V (sometimes 7.4/8.4 V for high-voltage servos).
  • Power supply – provides a constant power supply to the receiver, servos, gyros, lights, and other electronics.
  • Weight and simplicity benefits —eliminates the need for an additional receiver battery, reduces cabling, and minimizes the risk of errors.

Types of BEC

  • Linear BEC – simple and quiet (no switching frequency), but less efficient: excess voltage is converted into heat. Suitable for lower input voltages (e.g., 2S–3S).
  • Switching (switch-mode) BEC – high efficiency, can handle higher input voltages and higher currents (ideal for 4S–8S or multiple/high-power servos). May produce a small amount of electrical noise, but is the de facto standard for high-power setups.

What do you use a BEC for?

  • RC cars - power supply for steering servo and receiver (and possibly fan/LEDs).
  • RC airplanes/helicopters – power supply for multiple servos, gyro/stabilization, and receiver; often higher current demand for 3D/acro flying.
  • RC boats – power supply for the rudder servo, receiver, and accessories while the main motor runs on the drive battery.

Practical tips

  • Choose a BEC with ample current reserve (continuous and peak current) for the number and power of your servos.
  • Check the output voltage (5/6 V or HV 7.4/8.4 V) and make sure your servos and receiver are compatible with it.
  • Pay attention to cooling, especially with linear BECs and high loads.
  • In case of malfunctions or twitching: keep the wiring neat, use a glitch buster if necessary, or consider an external (switch-mode) BEC.

Conclusion

A BEC is a voltage regulator that safely and stably powers your RC model’s electronics from the main battery. This makes your setup lighter, simpler, and more reliable. Choose the right type and the correct output voltage/current capacity for your model and the number of servos— then your model will drive, sail, or fly without any problems.