RadioMaster ERS-CV01 Cell Volt Sensor
by RadioMaster

The RadioMaster ERS-CV01 Cell Volt Sensor is a high-precision telemetry module designed to provide real-time battery voltage monitoring for ExpressLRS (ELRS) systems. Specifically engineered for use with ELRS PWM receivers, this sensor allows pilots to track the voltage of individual battery cells or total pack voltage directly on their transmitter. By providing instant feedback and low-voltage alarms, the ERS-CV01 is an essential safety component for preventing over-discharge, extending the lifespan of expensive LiPo batteries, and ensuring the operational integrity of high-value aircraft. Its "plug-and-play" design makes it a favorite for fixed-wing pilots and sUAS operators who prioritize simplicity and reliability.

This sensor is a vital tool for the professional sUAS market, government contractors, and the educational sector. In university robotics labs, the ERS-CV01 provides a reliable data point for power management studies and long-endurance flight testing. For military and industrial contractors, the ability to monitor fuel (battery) levels in real-time during tactical reconnaissance or infrastructure inspection is critical for mission success and risk mitigation. Its ultra-compact footprint and negligible weight ensure that it can be integrated into any airframe—from micro-trainers to large-scale professional drones—without impacting flight performance or center of gravity.

Specifications

• Sensor Type: Precision Voltage Divider / Telemetry Sensor

• Input Voltage Range: 2S - 6S LiPo (7.4V – 25.2V)

• Voltage Accuracy: ±0.1V

• Communication Protocol: CRSF / ExpressLRS Telemetry

• Dimensions: 18.0mm x 11.5mm x 2.5mm

• Weight: 1.1g (excluding wires)

• Compatibility: RadioMaster ER-series PWM receivers and other ELRS receivers with telemetry ports

• Connection Interface: Solder pads / Plug-in lead for battery balance port

• Operating Temperature: -10°C to +60°C

What is Included

• 1x RadioMaster ERS-CV01 Cell Volt Sensor

• 1x Battery Balance Lead Connector (JST-XH compatible)

• 1x Receiver Connection Wire

• Transparent Heat Shrink Tube