1. Product Overview
The ANCEL BM200 Pro is a wireless battery monitor designed to provide continuous, real-time monitoring of your vehicle's 12-volt lead-acid battery. It offers multiple test functions and features for comprehensive battery health management.

Figure 4: The ANCEL BM200 Pro display unit illustrating its multi-test functions, including Battery Test, Cranking Test, Charging Test, Voltage Test, State of Health (SoH), State of Charging (SoC), and Temperature Display.
Key features and functions include:
- Battery Test: Assesses overall battery health.
- Cranking Test: Evaluates the starting system performance.
- Charging Test: Monitors the alternator's charging output.
- Voltage Test: Real-time voltage monitoring.
- State of Health (SoH) & State of Charging (SoC): Provides detailed battery status.
- Temperature Display: Monitors battery temperature.
- 433MHz Wireless Transmission: Stable and convenient data transmission up to 70 feet.
- Built-in Alarm Function: Alerts for abnormal battery conditions.
- Two Charging Modes: Solar and Type-C for the display unit.
- IP67 Waterproof Design: Ensures durability in various conditions.
- Flame Retardant Material: Enhanced safety.
- Low Power Consumption: Efficient operation with automatic connection.
- Security Protection: Reverse connection, overheat, short circuit protection, and built-in fuse.
- Built-in Shock Sensor: Automatic sleep mode to save power.
2. Installation
Proper installation of the BM200 Pro monitor unit is crucial for accurate data collection and reliable wireless transmission.

Figure 5: Visual guide for the four installation steps of the ANCEL BM200 Pro: 1. Connect black clip to negative terminal. 2. Connect red clip to positive terminal. 3. Stick the monitor unit onto the battery surface. 4. Place the display unit in front of the windshield.
- Connect Negative: Firmly connect the black clip of the monitor unit to the negative (-) pole of the vehicle battery.
- Connect Positive: Firmly connect the red clip of the monitor unit to the positive (+) pole of the vehicle battery.
- Mount Monitor Unit: Stick the monitor unit onto the battery surface using the provided double-sided tape.
- Position Display Unit: Place the display unit in a suitable location on your dashboard, typically in front of the windshield, ensuring clear visibility and optimal wireless reception.
Important Tips:
- Ensure the device is securely installed for the first time. Loose installation may cause abnormal data capture and display.
- Verify the RF signal icon in the upper right corner of the display. A visible RF symbol indicates the display is successfully connected to the monitor unit and is receiving real-time data. If the RF symbol does not appear, try restarting the display unit.
3. Operating the ANCEL BM200 Pro
The BM200 Pro continuously monitors your battery and transmits data wirelessly to the display unit. The display provides real-time information and alerts.
3.1. Battery Test Functions
The display unit shows various battery parameters:
- Battery Test: Provides an overall assessment of battery health, often displayed as a percentage (SoH).
- Cranking Test: When the engine starts, the device automatically tests the cranking system, displays the cranking voltage, and determines if the starting process is abnormal.
- Charging Test: After the car starts, it monitors the charging system, displays the charging percentage in real-time, and assesses the alternator's working condition.
- Voltage Test: Continuously monitors battery voltage, helping to predict potential battery maintenance issues.
3.2. Wireless Transmission

Figure 6: The ANCEL BM200 Pro demonstrating its 433MHz wireless transmission capability, allowing stable data transfer between the battery monitor and the display unit over a distance of 30-70 feet.
The BM200 Pro utilizes 433MHz wireless transmission technology, offering a stable connection and convenient monitoring from a distance of 30 to 70 feet. This allows for effective battery monitoring even when outside the vehicle.
3.3. Built-in Alarm Function

Figure 7: The ANCEL BM200 Pro's built-in alarm function, highlighting alerts for low voltage, low battery, high temperature, abnormal cranking, and abnormal charging, providing timely warnings for proactive maintenance.
The device provides timely automatic alerts for abnormal data, including:
- Low voltage
- Low battery
- High temperature
- Abnormal cranking
- Abnormal charging
These alerts help ensure proactive maintenance and prevent unexpected battery failures.
3.4. Charging the Display Unit

Figure 8: The ANCEL BM200 Pro display unit illustrating its two charging modes: solar charging via the integrated panel and Type-C charging (5V charger) for simultaneous power replenishment.
The BM200 Pro display unit supports two charging methods:
- Solar Charging: The integrated solar panel allows for continuous charging when exposed to sunlight.
- Type-C Charging: Connect a 5V Type-C charger for faster or indoor charging.