1. Introduction
The FNIRSI BTM-24 is a professional battery tester designed to ensure the stable operation of various types of 12V and 24V batteries. This device accurately detects multiple key indicators of batteries, providing a scientific basis for assessing their health status. It is suitable for use in the automotive industry, power industry, communications industry, industrial equipment, and medical equipment.
Key Features:
- Intuitive Interface: The main interface is designed with five major functions: Battery Measurement, Startup Measurement, Load Measurement, Charging Measurement, and System Settings, ensuring comprehensive functionality and user-friendly operation.
- Comprehensive Battery Detection: Equipped with clips for accurate battery voltage detection, supporting 7 detection standards, and measuring internal resistance for a complete battery status evaluation.
- Startup Performance Evaluation: Features a dedicated startup measurement module that provides a reliable assessment of the vehicle's starting system health based on reference voltage standards.
- Customizable System Settings: Powerful system settings include simplified Chinese and English language switching, day and night mode theme switching, and the option to restore factory settings to meet the personalized needs of different users in different environments.
2. Packing List
Please check the contents of your package upon receipt:
- BTM-24 Host (1 unit)
- Carrying Bag (1 unit)
- Data Cable (1 unit)
- User Manual (1 unit)
- Packing Box (1 unit)
3. Setup
Before performing any tests, ensure the vehicle's engine is off and the ignition key is in the OFF position (if applicable).
- Review Battery Specifications: Locate the battery label and note down the voltage (12V or 24V) and CCA (Cold Cranking Amps) rating. This information is crucial for accurate testing.
- Connect the Tester:
- Connect the red (positive) clamp of the BTM-24 tester to the positive (+) terminal of the vehicle battery.
- Connect the black (negative) clamp of the BTM-24 tester to the negative (-) terminal of the vehicle battery.
- Power On: The tester will automatically power on once connected correctly.
4. Operating Instructions
The BTM-24 offers several testing modes to diagnose your battery and charging system. Navigate through the menu using the directional buttons and confirm selections with the 'OK' button.
4.1. Battery Test (Battery Measurement)
- From the main menu, select "Battery" (Battery Measurement).
- Set the parameters according to your battery's factory data (Voltage, CCA, Battery Type). Ensure these settings match your battery's specifications for accurate results.
- Start the test. The device will display the battery capacity, reference lifespan, and current status (e.g., Good, Charge, Bad).
Battery Test Parameters:
| SOH (State of Health) | Status | Description |
|---|---|---|
| 0-60% | Bad | Battery life is low |
| 60%-80% | Attention | Battery life is average |
| 80%-100% | Good | Battery life is good |
*Note: Before testing, turn off the engine and turn the key to the OFF position while the car is running.
4.2. Cranking Test (Startup Measurement)
- From the main menu, select "Start" (Startup Measurement).
- Start the car engine.
- The tester will display the launch performance and start voltage. Compare the results with the reference standard.
Startup Test Parameters:
| Cranking Voltage | Status | Description |
|---|---|---|
| ≥ 10.2V | Good | No action needed |
| 9.6-10.2V | Weak | Monitor battery health |
| < 9.6V | Low | Check wiring/charging system |
*Note: Before testing, turn off the engine and turn the key to the OFF position while the car is running.
4.3. Load Test (Load Measurement)
- From the main menu, select "Load" (Load Measurement).
- Start the engine and increase the engine speed to 2000-2500 RPM.
- Wait for 15 seconds, then press the 'OK' button to start the measurement.
- The tester will display real-time dynamic and minimum voltage readings.
Load Test Parameters:
| Min Voltage | Status | Description |
|---|---|---|
| >13.4V (24V system >25.6V) | Normal | Battery & charging OK |
| <12.8V (24V system <25.6V) | Low Voltage | Check alternator belt/wiring for issues |
*Note: Before the test, start the car, select the load test mode, press the OK button, increase the speed to 2000-2500, and then press the OK button to obtain the measurement results.
4.4. Charging Test (Charging Measurement)
- From the main menu, select "Charge" (Charging Measurement).
- Start the engine and increase the RPM to 2500-3000.
- Once the engine RPM is within the target range, wait 15 seconds, then press the test button.
- The tester will display dynamic, minimum, and maximum voltage readings, indicating the charging system's performance.
Charging Test Parameters:
| Parameter | Battery Status / Note |
|---|---|
| Max Voltage >15.0V (24V system >30.0V) | Overvoltage – Check regulator |
| Min Voltage <13.3V (24V system <26.6V) | Undervoltage – Check battery & alternator wiring |
| Dynamic Voltage >13.9V (24V system >27.8V) | Normal – Alternator Excellent |
| Dynamic Voltage >13.7V (24V system >27.4V) | Normal – Alternator Good |
| Dynamic Voltage >13.5V (24V system >27.0V) | Normal – Alternator Normal |
| Dynamic Voltage >13.3V (24V system >26.6V) | Normal – Check alternator condition |
4.5. System Settings
Access the "System" menu to configure various settings:
- Language: Switch between Chinese and English.
- Display Mode: Toggle between Day and Night modes for optimal visibility in different lighting conditions.
- Restore Factory Settings: Reset all settings to their default values.
4.6. Video Demonstration
Watch this video for a visual guide on how to use the FNIRSI BTM-24 battery tester for various tests.
5. Specifications
| Parameter | Function Description |
|---|---|
| Voltage Range | 12V / 24V |
| CCA Test Range | 0 – 2000 CCA (Selectable) |
| Screen Material | 2.4-inch color screen |
| Language | Chinese, English |
| Product Size | 80.52 * 155.76 * 28.15 mm |
| Bare Weight | ≈479g |
| Power Source | DC |
| Battery Included | No |
| High-concerned chemical | None |
5.1. Supported Battery Standards
The BTM-24 is compatible with 6 car battery standards for real-time internal resistance testing:
- CCA (Cold Cranking Amps)
- IEC (International Electrotechnical Commission)
- EN (European Norm)
- DIN (Deutsches Institut für Normung)
- JIS# (Japanese Industrial Standards)
- GB (Chinese National Standard)
5.2. Standard Selection Examples
| Battery Label | Standard Selection | Battery Parameter | Remarks |
|---|---|---|---|
| 12V/60Ah/CCA 500A | CCA | 300 | 12V battery, 60Ah capacity, cold start current 500A |
| 300A EN | EN | 300 | EN standard value is 300A |
| 12V 250A 60Ah DIN | DIN | 250 | 12V battery, 60Ah capacity, DIN standard rated value: 250A |
| 26A 19RMF 12V 60Ah | JIS# | 200 | 12V battery, JIS code 26A19R → CCA: 200A |
| 12V 60Ah | Capacity | 60Ah | CCA value estimated from capacity (when standard is not available) |
5.3. Reference CCA Value by Engine Displacement
| Engine Displacement | Reference CCA Value |
|---|---|
| 1200~1600 CC | 350 |
| 1600~2000 CC | 500 |
| 2000~3000 CC | 650 |
| 3000 CC Up | 750 |
6. Maintenance
- Cleaning: Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Storage: Store the BTM-24 in its carrying bag in a cool, dry place away from direct sunlight and extreme temperatures.
- Cable Care: Ensure the alligator clips and cables are not damaged or frayed. Replace if necessary.
- Software Updates: Check the manufacturer's website periodically for any firmware updates.
7. Troubleshooting
If you encounter issues with your BTM-24, refer to the following common problems and solutions:
- Device does not power on:
- Ensure the clamps are securely connected to the correct battery terminals (red to positive, black to negative).
- Check for any damage to the cables or clamps.
- Inaccurate readings:
- Verify that the battery parameters (Voltage, CCA, Battery Type) entered into the tester match your battery's specifications.
- Ensure clean contact between the clamps and battery terminals. Corroded terminals can affect readings.
- "Low Lifespan" or "Bad Battery" result:
- This indicates the battery may need replacement. Consider having it professionally checked.
- "Weak" or "Low" Cranking Voltage:
- Monitor battery health closely. If "Low", check the vehicle's wiring and charging system.
- "Low Voltage" in Load Test:
- Check the alternator belt for wear and the wiring for any short circuits.
- "Overvoltage" or "Undervoltage" in Charging Test:
- Overvoltage: Check the voltage regulator.
- Undervoltage: Check connection points, wires, and the alternator.
8. User Tips
- For optimal accuracy, ensure the battery terminals are clean and free of corrosion before connecting the tester.
- Always follow the on-screen prompts during testing, especially for load and charging tests which require specific engine RPMs.
- The day and night modes are very useful for clear visibility in different lighting conditions. Switch to the appropriate mode for better readability.
- Keep the user manual handy for quick reference to test parameters and troubleshooting steps.
9. Warranty and Support
FNIRSI products undergo strict quality inspection before being sent out. If you have any questions, need technical assistance, or require help with your product, please contact our customer support team. Refer to your purchase documentation for specific warranty details and contact information.
