BEC Voltage Regulators
Keep your electronics safe, stable, and running strong. Castle’s Battery Eliminator Circuits (BECs) eliminate the need for separate receiver packs by regulating voltage directly from your main battery. Whether you're running high-torque servos, demanding flight controls, or multi-cell power systems, our BECs provide clean, consistent power exactly where you need it.
From compact rigs to extreme builds, Castle BECs are trusted across air, land, and commercial platforms — delivering precision voltage control and thermal reliability in any environment.
How do I know if I need an external BEC?
If you're experiencing brown-outs, glitching, or slow actuating servos it may be time to try an external BEC (Battery Eliminator Circuit). This scenario can occur in an application which uses high powered servos (or additional torque increasing modifications), where the ESC does not have an internal BEC, or the existing internal BEC is simply inadequate. A BECs primary purpose is to draw voltage from the motor batteries and drop it to a voltage level that is suitable for your receiver and servos. Simply put, an external BEC will provide clean and constant power and ensure you are not underpowered. Installing a BEC is pretty easy, assuming you don’t mind a little soldering. Our BECs include wiring instructions.
Compare Castle BECs: Find the Right Voltage Regulator for Your Build
Need help choosing the right Castle BEC for your RC project? Use the chart below to compare key specs like voltage range, current ratings, waterproofing, and weight. Whether you're powering high-torque servos in a 1/10 crawler or flying a 12S-capable drone, there's a Castle BEC that fits your build and keeps your electronics protected.
| CC BEC Comparison Chart |
| Part Number: | 010-0004-00 | 010-0004-01 | 010-0154-00 | 010-0153-00 |
| Common applications: | Crawlers, Racing, Sport Planes, Night Flyers | Helis, 1/5th Scale Cars, Giant Scale Planes, UAS | Helis, Planes, UAS, Racing | Crawlers, Marine, Sea Planes, UAS, Industrial |
| Waterproof: | No | No | No | Yes |
| Peak current: | 10A | 20A | 14A (dependent upon input and output voltage) | 15A (dependent upon input and output voltage) |
| Continuous current1: | 2S-3S: 7A
3S-6S: 5A | 2S-4S: 15A
5S-6S: 13A
7S-8S: 11A
9S-10S: 9A
11S-12S: 8A | 4.75-7.0V output: 9A
7.25V-8.5V output: 8A
8.75V-10.0V output: 7A
10.25-12.0V output: 6A | 4.75- 6.0V output: 10A
6.25-8.5V output: 9A
8.75-10.0V output: 8A
10.25-12.0V output: 7A |
| Max volts: | 6S (25.2V) | Surface: 8S (33.6V)
Air (w/Brake): 10S (42.0V)
Air (No Brake): 12S (50.4V) | Surface: 12S (50.4V)
Air (W/Brake): 12S (50.4V)
Air (No Brake): 14S (58.8V) | Surface 12S (50.4V)
Air (w/Brake): 12S (50.4V)
Air (No Brake): 14S (58.8V) |
| Adjustable output voltage2: | 4.8 to 9V | 4.9 to 12.5V | 4.75 to 12V | 4.75 to 12V |
| Default setting: | 5.1V | 5.1V | 5.25V | 5.25V |
| Length: | 1.7" (43mm)
| 1.86" (47mm) | 1.69" (43mm) | 1.37" (35mm) |
| Width: | 0.57" (15mm)
| 1.30" (33mm) | 0.56" (14mm) | 0.69" (18mm) |
| Height: | 0.48" (12mm) | 0.86" (22mm) | 0.32" (8mm) | 0.75" (19mm) |
| Shipped weight3: | 0.53 oz. (15.2g) | 1.4 oz. (40g) | 0.7 oz. (21g) | 1.0 oz. (28g) |
Footnotes:
1. Ratings are determined with a 5mph airflow at 25° C (77° F).
2. Adjustable Output Voltage may be set with Castle Link (sold separately).
3. Weight with full length wires, power wires may be shortened to save weight depending on application.
Still Not Sure Which BEC You Need?
Check your servo draw, input voltage, and regulator placement. When in doubt, always size for the peak amp load plus some overhead. For expert advice, visit our Support Page or contact Castle directly.
