1. Introduction
The KONNWEI KW208 12V Car Battery Tester is a professional automotive diagnostic tool designed to effectively analyze and read important car battery data. It provides accurate results for voltage, internal resistance, cold cranking amp (CCA), AH capacity, battery health, and charge status. This device helps technicians and DIY enthusiasts quickly and precisely diagnose battery issues, calculate the battery's cold cranking capability, and assess its aging extent.
The KW208 offers a quick, simple, and cost-effective solution for monitoring battery charging status, checking overall battery health, and detecting potential faults.
Figure 1: KONNWEI KW208 Battery Tester with its main functions illustrated.
2. Key Features
- Multi-Functions: Includes Battery Test, Cranking Test, and Charging Test functions to analyze battery health status and provide suggested solutions.
- Convenience: No internal batteries required; powers directly from the 12V battery. Testing is performed by simply connecting the electrodes.
- Professional Standards: Supports most global battery standards including CCA, BCI, CA, MCA, JIS, DIN, IEC, EN, and SAE.
- Efficiency & Safety: Utilizes advanced conductive technology for high accuracy results. Designed with polarity reverse connection protection to prevent damage to the device, car, or battery.
- Multi-language Support: Available in 8 languages: English, German, French, Dutch, Russian, Spanish, Italian, and Portuguese.
- Data Readings: Displays real-time battery voltage, internal resistance, cold cranking amp, AH capacity, battery health, and charge status.
- Data Record & Replay: Ability to record and replay battery data for analysis.
- Wide Compatibility: Compatible with 12V 100-2000 CCA regular flooded batteries, AGM flat plate, AGM spiral, GEL, and EFB batteries.
- High Accuracy: Equipped with an intelligent 2.4” backlit display and STM32 main chip for fast and practical reading access, offering up to 99.5% accuracy.
Figure 2: Overview of KONNWEI KW208's multifunctional capabilities.
Figure 3: KW208 protection features including overvoltage input protection and anti-back pressure access, alongside various test icons.
3. Specifications
| Feature | Specification |
|---|---|
| Model Name | KONNWEI KW208 |
| Special Features | Battery Tester, Cranking Test, Charging Test, Standard Test |
| Software Update | No |
| Language Support | English, German, Portuguese, Italian, Russian, Spanish, French, Dutch |
| Software Version | KONNWEI KW208 |
| Hardware Version | KONNWEI KW208 |
| Brand Name | KONNWEI |
| Origin | Mainland China |
| Item Type | Code Readers & Scan Tools |
| Certification | CE |
| Screen Size | 2.4 inch Backlit LCD |
| Voltage Measurement Range | 8-16V DC |
| Operating Temperature | -20°C to 70°C (-4°F to 158°F) |
| Storage Temperature | -30°C to 80°C (-22°F to 176°F) |
| Supported Battery Types | Regular Flooded, VRLA, MF, SMF, AGM (Flat Plate, Spiral), EFB, GEL Cell |
| Supported Test Standards | CCA: 100-2000, BCI: 100-2000, CA: 100-2000, MCA: 100-2000, JIS: 26A17-24SH52, DIN: 100-1400, IEC: 100-1400, EN: 100-2000, SAE: 100-2000 |
| Accuracy | 99.5% |
| Algorithm | KW-BTCAL™ |
Figure 4: Supported battery standards and their test ranges.
Figure 5: Feature comparison between KONNWEI KW208 and other battery testers.
4. Setup
The KONNWEI KW208 is designed for ease of use with no complex setup required. It draws power directly from the vehicle's 12V battery.
4.1 Connecting the Tester
- Ensure the vehicle's ignition is off.
- Connect the red clip of the KW208 to the positive (+) terminal of the 12V battery.
- Connect the black clip of the KW208 to the negative (-) terminal of the 12V battery.
- The device will power on automatically and display the main menu.
Figure 6: The KW208 comes with two possible styles of power clips, shipped randomly.
5. Operating Instructions
Once the KW208 is connected to the battery, use the 'EXIT', 'ENTER', and arrow buttons to navigate the menu and perform tests.
5.1 Battery Test
This function assesses the overall health of your battery.
- From the main menu, select 'Battery Test' (or 'Check' then 'Battery Test').
- Select the type of battery (e.g., Regular Flooded, AGM Flat Plate, AGM Spiral, GEL, EFB).
- Enter the battery's rated CCA (Cold Cranking Amps) or other relevant standard (BCI, CA, MCA, JIS, DIN, IEC, EN, SAE) as indicated on the battery label.
- The tester will perform the analysis and display results such as 'Good', 'Recharge', or 'Replace', along with internal resistance (mΩ) and life percentage (%).
Figure 7: The KW208 displaying battery test results, indicating a 'GOOD BATTERY'.
Figure 8: Example results for Battery Test, Charging Test, and Cranking Test.
5.2 Cranking Test
This test analyzes the actual cranking voltage and time to evaluate the health of the vehicle's starting system.
- From the main menu, select 'Cranking Test' (or 'Check' then 'Cranking Test').
- Follow the prompts on the screen to start the engine.
- The tester will automatically record and display the cranking time, maximum voltage, and minimum voltage during the start-up process. It will then provide a diagnosis, e.g., 'CRANKING LOW'.
Figure 9: Visual guide for performing the Cranking System Test.
Figure 10: The Cranking Test analyzes the actual cranking voltage and time to quickly assess the cranking system's state.
5.3 Charging Test
This test evaluates the output voltage of the generator, the rectifier diode, and the charging current to provide an accurate assessment of the charging system.
- From the main menu, select 'Charging Test' (or 'Check' then 'Charging Test').
- Follow the prompts on the screen, which typically involve increasing the engine speed to approximately 2500 RPM for 5 seconds.
- Press 'ENTER' when prompted.
- The tester will display results such as 'CHARGING NORMAL' or indicate any issues with the charging system.
Figure 11: The Charging System Test provides an accurate assessment of the generator, rectifier diode, and charging current.
5.4 Language Selection
The KW208 supports 8 different languages. To change the language:
- From the main menu, select 'Setup'.
- Navigate to 'Language' and press 'ENTER'.
- Use the arrow buttons to select your desired language (English, German, French, Dutch, Russian, Spanish, Italian, Portuguese) and press 'ENTER' to confirm.
Figure 12: The KW208 supports multiple languages for user convenience.
5.5 Product Demonstration Video
Video 1: A demonstration of the KONNWEI KW208's features and operation.
6. Maintenance
- Cleaning: Use a soft, dry cloth to clean the device. Avoid using abrasive cleaners or solvents.
- Storage: Store the KW208 in a dry, cool place away from direct sunlight and extreme temperatures.
- Cable Care: Inspect the test cables and clips regularly for any signs of damage. Do not use the device if the cables are frayed or damaged.
- Software: The device does not support software updates.
7. Troubleshooting
| Problem | Possible Cause | Solution | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Device does not power on | Incorrect connection to battery terminals; Battery voltage too low; Damaged cable/clips. | Ensure red clip is on positive (+) and black on negative (-). Check battery voltage (must be 8-16V). Inspect cables for damage. | ||||||||||
| Inaccurate test results | Loose connections; Incorrect battery type/standard selected; Battery terminals are dirty. | Ensure clips are securely attached. Verify correct battery type and standard input. Clean battery terminals. | ||||||||||
| Screen is blank or frozen | Temporary software glitch. | Disconnect the device from the battery, wait a few seconds, then reconnect. | ||||||||||
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