1. Introduction
The SUNKKO T-688A is a microcomputer-controlled comprehensive parameter tester designed for various rechargeable batteries. It utilizes a low-power computing chip from the USA and a microcomputer chip from Taiwan to precisely test battery parameters. This device is capable of accurately displaying voltage, resistance, and capacity with 4-digit precision. Its powerful functions make it suitable for testing voltage, resistance, capacity, charging, and discharging of both lithium and Ni-MH batteries.
The T-688A is ideal for manufacturers producing lithium batteries, NiMH batteries, portable batteries, and portable power banks for quality control. It is also useful for purchasing quality checks and maintenance in repair shops.
2. Package Contents
Please check the package for the following items:
- 1 x SUNKKO T-688A Tester
- 1 x Battery Testing Fixture
- 1 x Clip for Battery
- 1 x Power Cord
- 1 x User Manual (this document)
3. Specifications
| Parameter | Value |
|---|---|
| Model | T-688A |
| Type | Household Battery Tester |
| DIY Supplies | Electrical |
| Certification | CE |
| Supply Voltage | AC110V/AC220V |
| Test Voltage | Within 5.5V |
| Discharge Current | 0.5A / 1A / 2A |
| Set Charging Current | 0.5A / 1A / 2A |
| Overload Scanning Test | 0 ~ 3A |
| Internal Resistance Test Range | 0 - 2000mΩ |
| Capacity Detection | 0 - 9999mAh |
| Product Size | 260 x 190 x 90mm |
| Product Weight | 1.4kg |
| Battery Included | No |
4. Setup Instructions
Connect Power: Insert the power cord into the power line interface on the back of the tester. Ensure the main power switch is in the OFF position before connecting. Once connected, turn the main power switch to ON.
Figure 4.1: Rear view of the tester with power connection points. Prepare Battery Fixture: The tester comes with a dedicated battery testing fixture and a clip for batteries. Select the appropriate fixture or clip based on the battery type you are testing (e.g., 18650, 14500, 26650, 32650, polymer soft pack, lithium iron phosphate). The fixture supports two types of clamps to accommodate different battery sizes.
Figure 4.2: Compatible battery types and connection accessories. Connect Battery Fixture: Connect the USB cable from the battery testing fixture to the "TEST IN" USB port on the front panel of the tester.
Power On: Press the power button (
) on the front panel to start the functional power supply.
Important Safety Note:
- If the battery's positive and negative terminals are installed incorrectly, a red light will illuminate, and the machine will emit a long beep. Correct the battery orientation immediately.
- When the battery is installed correctly, a blue light will illuminate, and the machine will beep twice.
5. Operating Instructions
The SUNKKO T-688A offers various testing modes. Below are common operations:
5.1. Interface Overview
5.2. Battery Type Selection (Li/NH)
- After powering on, press the "LIO/NH" button to switch between Lithium (Li) and Ni-MH (NH) battery test modes.
- In "Li" mode, the minimum cut-off voltage is 2.75V.
- In "NH" mode, the minimum cut-off voltage is 0.7V.
5.3. Setting Discharge Current
- Press the "SET C-C" button to select the desired discharge current: 0.5A, 1A, or 2A.
- The discharge time (H) is calculated as: Battery Capacity (AH) / Discharge Current (A).
- 0.5A (Small Current): Suitable for slow discharge of small capacity batteries.
- 1A (Regular Current): Standard discharge for single cells.
- 2A (Slightly Faster Current): Rapid discharge for single cells.
5.4. Capacity Measurement (Discharge Test)
- Ensure the battery is correctly installed in the fixture.
- Press the "AH" button to start the discharge process. The tester will begin discharging the battery and display the capacity value in mAh.
- During discharge, the LED screen will show the battery capacity. The maximum capacity is displayed when the battery voltage reaches its cut-off point.
5.5. Charging Function
- Ensure the battery is correctly installed.
- Press the "CHG" button to start charging the battery.
- The tester features intelligent charging with an automatic full stop. During charging, the LED screen displays the actual voltage. Once charging is complete, the product will automatically shut down and stop.
5.6. Automatic Capacity Measurement (Charge-Discharge Cycle)
- With the tester in charging mode, simultaneously press the "AH/AUTO TEST" button.
- The tester will automatically switch to discharge status after charging is complete, then test the battery capacity. This provides a more accurate capacity measurement after a full charge and discharge cycle.
5.7. Internal Resistance Test
- Ensure the battery is correctly installed.
- Press the "mΩ" button to detect the battery's internal resistance. The display will show the internal resistance value in mΩ.
- This function can test internal resistance parameters for all kinds of lithium and Ni-MH batteries.
5.8. Overload Test
- Press the "SCAN C-C" button to perform an overload scanning test. The test range is 0 ~ 3A.
5.9. Video Demonstration
Watch this video for a visual guide on setting up and operating the SUNKKO T-688A tester:
6. Maintenance
- Cleaning: Regularly wipe the exterior of the tester 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.
- Ventilation: Ensure the intelligent cooling system's fan on the rear panel is not obstructed to prevent overheating.
- Power Cord: Inspect the power cord for any signs of damage. Replace if necessary.
- Battery Fixtures: Keep the battery testing fixture and clips clean and free from debris to ensure good contact with batteries.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Tester does not power on. | Power cord not connected, main power switch off, or power outlet issue. | Ensure power cord is securely connected. Turn on the main power switch on the rear panel. Check power outlet with another device. |
| Red light and long beep when inserting battery. | Incorrect battery polarity (positive/negative terminals reversed). | Remove the battery and re-insert it with the correct polarity. Refer to battery markings. |
| No blue light or double beep after correct battery insertion. | Poor contact with battery terminals, or battery is completely dead. | Adjust the battery in the fixture to ensure good contact. Try a different battery to confirm tester functionality. |
| Inaccurate readings. | Dirty contacts, incorrect settings, or faulty battery. | Clean battery and fixture contacts. Verify correct battery type (Li/NH) and discharge current settings. Test with a known good battery. |
8. User Tips
- For the most accurate capacity measurement, utilize the automatic charge-discharge cycle function (AH/AUTO TEST). This ensures the battery is fully charged and then discharged under controlled conditions.
- When testing internal resistance, ensure the battery terminals are clean to avoid false high readings.
- Always select the correct battery type (Lithium or Ni-MH) using the LIO/NH button before starting any test to prevent damage or inaccurate results.
- Choose the discharge current (0.5A, 1A, 2A) appropriate for the battery's capacity and your testing needs. Lower currents provide a more thorough discharge but take longer.
9. Warranty and Support
This product comes with a one-year warranty from the date of purchase. Please retain your proof of purchase for warranty claims.
For technical support, troubleshooting assistance, or warranty inquiries, please contact your retailer or the manufacturer directly. Refer to the contact information provided with your purchase documentation.
