BetaFPV F4 1-2S 12A AIO ELRS Flight Controller – FC for Cetus X ELRS Drone from BetaFPV — is a compact and highly efficient stack (FC+ESC) designed specifically for ultralight 1S/2S models, including Cetus X ELRS, 85mm whoop quadcopters (e.g., Meteor85), and 3" toothpick drones (e.g., HX115 SE and HX115 LR).

The board is presented in V2.2 version and features an updated BMI270 (SPI) gyroscope and modern BB51 ESC hardware, replacing the outdated ICM20689 and BB21. This combination of flight controller and high-performance BLHeli/Bluejay ESC ensures stable and controlled flight even on the smallest frames.

Key Advantages

• Optimized for ultralight 3" toothpick and 85mm whoop frames — ideal for Meteor85, HX115 SE FPV Quad, and Cetus X.
• Integrated 12A (continuous current) ESC instead of the typical 5A in many 1S controllers — more thrust and power reserve for aggressive maneuverability.
• Built-in current meter, two programmable RGB LEDs, and SPI ELRS support; additional pads for external receivers via UART1 and UART2 are preserved.
• Large motor pads (1.25mm Header Pins) simplify soldering and cable installation.

FC Specifications

• Model: F4 1S 12A AIO FC
• Weight: 4.74 g (without power cable and BT2.0 connector)
• Processor: STM32F411CEU6 (100 MHz)
• Gyroscope: BMI270 (SPI)
• Firmware Version: betaflight_4.3.1_BETAFPVF4SX1280 (ELRS) / betaflight_4.2.11_BETAFPVF411RX (Frsky)
• OSD: Built-in BetaFlight OSD (STM32 controls OSD chip via SPI in DMA mode)
• Receiver: SPI ELRS 2.4G Receiver / SPI Frsky
• Motor Connector: 1.25mm Header Pins
• Mounting Hole Size: 26mm x 26mm (suitable for whoop-type mounting hole)
• USB Port: SH1.0 4-Pin

ESC Specifications

• Integrated ESC: 12A continuous current, 25A peak current
• Input Voltage: 1S-2S
• ESC Firmware: C_X_30_48_V0.18.1.hex for Bluejay BB51 hardware
• Signal Support: D-shot150, D-shot300, D-shot600, Oneshot125, Multishot, PWM

Recommended Compatibility and Spare Parts

• Drones: Cetus X; 85mm whoop frames (Meteor85, Meteor85 HD); 3" toothpick models (HX115 SE, HX115 LR)
• Batteries: BT2.0 450mAh 1S 30C, 450mAh 2S 45C
• Motors: 1102 18000KV, 1103 11000KV
• Propellers: HQ3020 2-blade, 2020 4-blade

Package Contents

• 1 × F4 1S 12A AIO FC
• 4 × Anti-vibration rubber dampers
• 4 × M2 x 10mm screws
• 4 × M2 x 10mm screws
• 4 × M2 nuts
• 8 × PH-1.25 motor connectors
• 1 × SH1.0 4-Pin cable
• 1 × SH1.0 4-Pin to USB Type-C adapter

If you are building a lightweight frame or upgrading a Cetus X or whoop project, this stack from BetaFPV offers an excellent balance of weight, power, and functionality: modern BMI270 gyroscope, BB51 hardware platform, ELRS support, and 1S-2S operation make it a versatile choice for FPV enthusiasts seeking ease of installation, flight quality, and reliability.

Other products in this category here Stacks (FC+ESC)