NJTY T2808 Battery Tester User Manual

1. Introduction

The NJTY T2808 is a smart battery diagnostic tool designed for in-depth analysis of 12V/24V lead-acid battery performance. It supports multiple scenarios for electric vehicles (EVs), cars, and trucks, providing quick and accurate detection and analysis of battery health. This device is an essential tool for automotive maintenance, repair shops, and DIY users.

Figure 1: NJTY T2808 Battery Analyzer with test clamps.

2. Safety Information

Please read and understand all safety instructions before using the device. Failure to follow these instructions may result in electric shock, fire, or serious injury.

• The machine itself has protection measures such as preventing polarity mismatch, preventing voltage from being too high (≤80V), and prompting for poor contact of the test chuck.
• Meets the safety standards of double insulation overvoltage standard CATII600V and pollution level 2.
• Do not remove the test clamps with both hands simultaneously to avoid accidental short circuits.
• Ensure proper ventilation when working with batteries, as they can emit explosive gases.
• Wear appropriate personal protective equipment, including safety glasses and gloves.

Figure 2: Safety features of the T2808, including polarity mismatch and overvoltage protection.

3. Package Contents

The package typically includes:

• 1 x NJTY T2808 Battery Analyzer
• 1 x Pair of Alligator Test Clamps (Red for positive, Black for negative)
• 1 x User Manual (this document)

4. Product Features

• All-in-One Machine: 12V/24V lead-acid battery performance in-depth analysis (status/internal resistance/voltage).
• Intelligent Diagnostics: Vehicle startup, charging process, and static battery three modes of one-key switching.
• Data Storage: 40 sets of data storage for tracking battery degradation trends.
• Military-Grade Protection: Anti-reverse connection, anti-overvoltage (up to 80V), anti-drop, and anti-shock design with a silicone protective case.
• Four-Wire Kelvin Technology: Eliminates wire resistance error, ensuring internal resistance measurement accuracy of ±1%.
• Dynamic Monitoring: Real-time analysis of voltage fluctuations during vehicle startup.
• Exclusive Mode for Electric Vehicles: Allows direct input of ampere-hours (AH) to match battery parameters of mainstream EV models.
• High-Definition Backlit Large-Screen Display: Clear visibility of measurement figures, even in dark environments.
• Bilingual Support: English and Chinese language options.

Figure 3: Key features including 12V/24V compatibility, charging test, battery state, voltage test, data storage, generator test, and start test.

5. Display and Controls

The NJTY T2808 features a clear display and intuitive controls:

Figure 4: Panel Introduction. Labels include Silicone Case, HD Display, Confirm Key (ENTER), Left, Flip Down (Down Arrow), Alligator Clip, Exit/Return Key (EXIT), Upturning (Up Arrow), Right.

Key Functions:

• ENTER: Confirm selection or start test.
• EXIT: Exit current menu or return to previous screen.
• Up/Down Arrows: Navigate through menu options or adjust values.
• Left/Right Arrows: Navigate through menu options or adjust values.

6. Setup

Before performing any tests, ensure the battery terminals are clean and free of corrosion for accurate readings.

1. Connect the Test Clamps: Connect the red test clamp to the positive (+) terminal of the battery and the black test clamp to the negative (-) terminal of the battery.
2. Power On: The device will automatically power on once connected to the battery.
3. Initial Screen: The display will show options to select the battery type (e.g., 'electric bicycle' or 'car battery').

7. Operating Instructions

The T2808 offers three main testing functions: Battery Test, Generator Charging System Test, and Starter System Start Load Test.

7.1. Battery Test (12V/24V)

1. Connect the Tester: Attach the red clamp to the positive battery terminal and the black clamp to the negative terminal.
2. Select Battery Type: Use the arrow keys to select 'electric bicycle' or 'car battery' based on your vehicle. Press ENTER.
3. Select Function: Choose 'battery' from the function menu. Press ENTER.
4. Select Test Standard: Choose the appropriate standard (e.g., CCA, IEC, EN, DIN, JIS, UNKNOW) for your battery. Press ENTER.
5. Adjust CCA Value: If prompted, adjust the CCA value to match your battery's specifications using the arrow keys. Press ENTER to start the test.
6. View Results: The device will display the test results, including voltage (vol), internal resistance (res), tested CCA (test), set CCA (set), battery life, and a general result (e.g., 'Good', 'Outstanding', 'Attention', 'Replace').

Figure 5: Flowchart for Battery Test, Generator Charging System Test, and Start System Load Test.

Figure 6: Battery Status Display Table and Start System Test Table for interpreting results.

7.2. Generator Charging System Test

1. Connect the Tester: Ensure the tester is connected to the battery.
2. Select Function: Choose 'generator' from the function menu. Press ENTER.
3. Start the Engine: Follow the on-screen prompt to start the vehicle's engine.
4. View Results: The device will display the dynamic voltage, maximum voltage (MAX), and minimum voltage (MIN) of the charging system.

7.3. Starter System Start Load Test

1. Connect the Tester: Ensure the tester is connected to the battery.
2. Select Function: Choose 'start' from the function menu. Press ENTER.
3. Start the Engine: Follow the on-screen prompt to start the vehicle's engine.
4. View Results: The device will display the dynamic voltage, start voltage, and minimum required start voltage.

7.4. Data Storage

The T2808 can store up to 40 sets of measurement history. To query the measurement history, press and hold the 'Left' arrow key for 3 seconds. To clear all stored data at once, long press the 'ENTER' key.

Figure 7: Illustration of the 40 sets of data storage feature.

7.5. Electric Bicycle Battery Amperage Selection

For electric bicycle batteries, you can directly input the Ampere-Hour (AH) value. This allows for accurate testing of EV batteries like those found in Tesla or BYD models.

Figure 8: Interface for selecting electric bicycle battery amperage.

8. Maintenance

• Cleaning: Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or solvents.
• Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
• Silicone Case: The protective silicone case helps guard against drops and impacts. Ensure it is properly fitted.
• Cable Care: Inspect the test cables and clamps regularly for any signs of wear or damage. Replace if necessary.

Figure 9: The T2808 features a protective silicone case for durability.

9. Troubleshooting

9.1. General Issues

• No Power: Ensure the test clamps are securely connected to the battery terminals. The device draws power directly from the battery.
• Inaccurate Readings: Check for clean battery terminals and secure connections. Ensure the correct battery type and CCA value are selected.
• Device Not Responding: Disconnect and reconnect the clamps. If the issue persists, the battery might be too low to power the device.

9.2. Charging System Test Specifics

• 12V System: If the voltage is greater than 15V (no load) or less than 13.3V (no load), check the voltage regulator, connections, wires, and generator.
• 24V System: If the voltage is greater than 30V (no load) or less than 26.6V (no load), check the voltage regulator, connections, wires, and generator.

10. Specifications

Figure 10: Product dimensions of the T2808.

11. User Tips

• For optimal accuracy, ensure the battery is at a stable temperature before testing.
• Always double-check the CCA value set on the tester against your battery's specifications for the most reliable results.
• The larger the CCA value and the lower the internal resistance, the better the battery performance.
• Regularly use the data storage function to track your battery's health over time, which can help predict potential failures.
• When testing electric vehicle batteries, remember to select the 'electric bicycle' mode and input the correct AH value.

12. Warranty and Support

For any issues or questions regarding your NJTY T2808 Battery Tester, please refer to the seller's support channels or contact the manufacturer directly. Keep your purchase receipt for warranty claims.