1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your BAFANG 850C Mid-Drive Motor Display. Designed for BAFANG BBS01 and BBS02 HD series motors, this display offers a comprehensive interface for monitoring your e-bike's performance. Please read this manual thoroughly before use to ensure proper function and longevity of your device.
Note: This display only supports BAFANG mid-drive motors (UART protocol) and is not compatible with HUB motors.
2. Package Contents
Upon opening your package, please verify that all the following items are included:
- 1x 850C / P850 Display Unit
- 1x Controller Cable
- Handlebar Clamps (for 31.8mm, 25.4mm, 22.2mm handlebars, includes transfer rings for smaller sizes)
- Mounting Screws


3. Specifications
| Feature | Description |
|---|---|
| Display Type | IPS Colorful Screen, 3.2-inch (High-contrast) |
| Compatibility | BAFANG BBS01, BBS02 HD series mid-drive motors (UART) |
| Battery Supply | 24V / 36V / 48V (user-definable) |
| Rated Operating Current | 40mA |
| Max Operating Current | 100mA (with 36V battery, USB equipment changed) |
| USB Charging Port | 5V 500mA |
| Speed Display | AVG Speed, MAX Speed, Real-time Speed |
| Unit | Kilometer/Mile (user-settable) |
| Assist Levels | 3-level / 5-level / 9-level (optional) |
| Mileage Indicator | Odometer, Trip Distance, Clock, Riding Time |
| Power/Current Indicator | Real-time power indicator (digital, analog, or current) |
| Error Code Indicator | Yes |
| Light Sensor | Optional |
| Software Upgrade | Via UART |
| Handlebar Clamps | 31.8mm, 25.4mm, 22.2mm (with transfer rings) |
| Waterproof Rating | IP65 |
| Certifications | CE / ROHS |
| High-concerned chemical | None |
| Origin | Mainland China |


4. Setup and Installation
Follow these steps to properly install your BAFANG 850C display on your e-bike:
- Choose Mounting Location: Select a suitable position on your handlebar for the display and remote control. Ensure it does not obstruct your view or interfere with braking/shifting.
- Attach Clamps: Use the appropriate handlebar clamp for your handlebar diameter (31.8mm, 25.4mm, or 22.2mm). Use the provided transfer rings if necessary. Securely attach the display and remote control clamps to the handlebar using the mounting screws.
- Connect Cables: Connect the display's cable to the controller cable. Ensure the connection is firm and secure. The display is designed for BAFANG mid-drive motors (UART protocol).
- Route Cables: Carefully route all cables along your bike frame, securing them with zip ties or cable clips to prevent snagging or damage during riding.
- Initial Power On: After installation, power on your e-bike system. The display should light up, indicating a successful connection.


5. Operating Instructions
The BAFANG 850C display provides a user-friendly interface for controlling and monitoring your e-bike.
5.1 Basic Functions
- Power On/Off: Press and hold the power button on the remote control to turn the display on or off.
- Assist Level Adjustment: Use the '+' and '-' buttons on the remote to cycle through the assist levels (3, 5, or 9 levels, depending on your setting).
- Information Display: The main screen shows real-time speed, assist level, battery status, and trip information.
5.2 Display Indicators
The display provides various indicators to keep you informed:

- Brake Indicator: Shows when brakes are applied.
- Speed Display: Real-time, average, and maximum speed.
- Mileage Indicator: Odometer, trip distance, clock, and riding time.
- Power Indicator: Real-time power (digital, analog, or current).
- Battery Indicator: Shows current battery charge level.
- PAS (Pedal Assist System): Indicates the current assist level (0-9).
- Error Indicator: Displays error codes if a system fault occurs.
- Headlight Power On: Indicates if the headlight is active.
- USB Charging: Indicates when a device is connected and charging via the USB port.
5.3 USB Charging Function
The display features a USB charging port (DC 5V 500mA) that allows you to charge small electronic devices like smartphones while riding.

6. Key Features
- High-Contrast IPS Colorful Screen: The 3.2-inch screen provides clear and vibrant visuals.
- Adjustable Brightness: The display brightness can be adjusted (levels 1-5) for optimal visibility in various lighting conditions, including direct sunlight.
- Waterproof (IP65): The display is rated IP65, offering protection against dust and low-pressure water jets, making it suitable for riding in various weather conditions.
- Software Upgradable: The display's software can be upgraded via UART, ensuring compatibility with future updates and features.


7. Maintenance
To ensure the longevity and optimal performance of your BAFANG 850C display, follow these maintenance guidelines:
- Cleaning: Wipe the display screen and body with a soft, damp cloth. Avoid using abrasive cleaners, solvents, or harsh chemicals that could damage the screen or casing.
- Water Exposure: While the display is IP65 waterproof, avoid submerging it in water or exposing it to high-pressure water jets. Dry the display thoroughly if it gets wet.
- Cable Inspection: Periodically check all cables and connections for any signs of wear, fraying, or damage. Ensure all connections are secure.
- Storage: When not in use for extended periods, store the e-bike and display in a dry, cool place away from direct sunlight and extreme temperatures.
8. Troubleshooting
If you encounter issues with your BAFANG 850C display, refer to the following common problems and solutions:
- Display Not Turning On:
- Check if the battery is charged and properly connected to the motor system.
- Ensure all cables between the display and the motor controller are securely connected.
- Verify the power button on the remote control is functioning correctly.
- No Speed Reading:
- Check the speed sensor and its magnet for proper alignment and proximity.
- Ensure the speed sensor cable is securely connected to the motor controller.
- Error Code Displayed:
- The display has an error code indicator. Refer to your BAFANG motor controller manual for a list of specific error codes and their meanings.
- Common issues include sensor malfunctions, motor overcurrent, or battery voltage problems.
- USB Charging Not Working:
- Ensure the display is powered on.
- Check the USB cable and the device being charged for proper connection.
- Verify the device requires 5V 500mA charging.
If the problem persists after attempting these solutions, please contact customer support.
9. User Tips
- Optimize Brightness: Adjust the display brightness according to ambient light conditions to conserve battery power and improve visibility.
- Regular Software Updates: Check for and install software updates via UART to ensure your display has the latest features and bug fixes.
- Secure Cabling: Always ensure all cables are neatly routed and secured to prevent accidental disconnections or damage during rides, especially on rough terrain.
10. Warranty and Support
For warranty information and technical support, please refer to the documentation provided with your BAFANG mid-drive motor kit or contact your retailer. Keep your purchase receipt as proof of purchase for any warranty claims.






