1. Introduction
The JUNCTEK BTS04 Series is an advanced multi-functional battery charger and tester designed for 18650 Li-ion batteries and other compatible types. It features four independent slots for simultaneous charging, discharging, capacity testing, and internal resistance measurement. With intelligent energy recycling technology and comprehensive safety protections, the BTS04 provides an efficient and reliable solution for battery management and analysis.
Figure 1: Front view of the JUNCTEK BTS04 Battery Tester with its display.
2. Package Contents
Please verify that all items listed below are included in your package:
Figure 2: Standard package contents.
- Main Unit × 1
- User Manual × 1
- 2-pin Green Terminal × 4
- Type-C Data Cable × 1
- Charger (default US plug) × 1
3. Product Features
- Multi-functional Design: Supports charging, discharging, capacity testing, and internal resistance testing.
- 4 Independent Slots: Allows simultaneous operation on up to four batteries.
- Smart Fast Charging: Efficiently charges batteries while monitoring their status.
- Energy Recycling Technology: Converts discharge energy from one battery to charge another, improving efficiency and reducing waste.
- Precise Parameter Measurement: Provides accurate readings for voltage, current, capacity, internal resistance, and operating time.
- Wide Battery Compatibility: Suitable for common cylindrical lithium batteries (e.g., 10400, 14500, 16340, 18650, 21700, 26650) and polymer pouch cells.
- DIY Modification Support: Equipped with positive and negative expansion terminals for custom wiring and modifications.
- Comprehensive Safety Protection: Includes reverse polarity, overcharge, over-discharge, and temperature control protections.
- Intelligent Fan Cooling: Built-in high-speed fan with smart program control for efficient heat dissipation.
- High-Definition Color Display: Clear and intuitive interface for monitoring battery data.
- Durable Construction: Premium acrylic panel for screen protection and silicone buttons for comfortable operation.
Figure 3: Energy Recycling Diagram.
Figure 4: Precise Parameter Measurement Display.
Figure 5: Compatible Battery Types.
Figure 6: DIY Expansion Terminals.
Figure 7: Safety Protection Features.
4. Setup Guide
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Power Connection
Connect the provided charger to the device's power input port and plug it into a suitable power outlet (default US plug). The device will power on automatically.
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Battery Insertion
Carefully insert up to four compatible batteries into the designated slots, ensuring correct polarity (positive (+) and negative (-) ends match the markings on the tester). The tester will automatically detect the battery and display initial voltage and resistance readings.
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Initial Check
After inserting a battery, wait for a slight delay for the data to stabilize and display accurate readings. Ensure the battery is fully charged for the most accurate resistance measurements.
5. Operating Modes
The BTS04 offers three intelligent operating modes to manage your batteries:
Figure 8: Intelligent Operating Modes.
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Charging Mode (CHG)
This mode provides smart charging support to restore battery vitality. It intelligently monitors the charging process to prevent overcharge.
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Discharging Mode (DIS)
Safely discharges batteries to release their full potential or to prepare them for storage. This mode is crucial for accurate capacity testing, as discharge capacity is used as the main reference.
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Cycling Mode (CYCLE)
Automatically performs up to 9 charge-discharge cycles. This mode is ideal for conditioning new batteries or reconditioning older ones, and for precise capacity measurement over multiple cycles.
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Battery Repair Mode
A dedicated solution for low-voltage batteries. Through slow charging, it gently awakens batteries and restores them to life.
Use the SET button to select the desired mode, and OK to confirm. The arrow buttons (up/down/left/right) navigate through options and channels. CLR clears data, and RSLT and CURVE display results and curves respectively.
6. Advanced Functions
6.1. PC Software Communication
Easily connect the BTS04 to a computer via the provided Type-C data cable for seamless integration and data synchronization. The PC software allows for real-time monitoring, data recording, and advanced analysis of battery performance, improving management efficiency.
Figure 9: PC Software Interface.
Note: PC software communication is only supported by the Bluetooth version (BTS04BL, BTS04CL).
6.2. Mobile APP Bluetooth Connection
For Bluetooth-enabled models (BTS04BL, BTS04CL), you can connect the tester to a mobile device via Bluetooth. The dedicated mobile app provides full insight into battery performance, displaying all measurement data clearly. This allows for convenient monitoring and control on the go.
Figure 10: Mobile App Interface.
Note: Bluetooth connection and mobile app viewing are supported only on the Bluetooth version.
6.3. Data Analysis Interfaces
The device and its accompanying software/app provide various interfaces for detailed data analysis:
- Discharge Interface: Clearly shows actual discharge capability.
- Charge Interface: Monitors charging efficiency.
- Result Interface: View each channel's cycle parameters clearly for comparison and analysis.
- Curve Interface: Intuitively understand charging/discharging performance and status through graphical representations.
- List Interface: Monitor multiple channels simultaneously to improve efficiency.
- Single-Channel Interface: Focus on one channel for in-depth performance analysis.
Figure 11: Accurate Battery Capacity Testing Interfaces.
Figure 12: Multi-Channel Data Interface.
7. Safety Protections
The BTS04 is equipped with comprehensive safety features to ensure safe and reliable operation:
- Reverse Polarity Protection: Prevents incorrect battery insertion and potential device damage.
- Overcharge Protection: Intelligently monitors and prevents excessive charging, protecting battery lifespan.
- Over-Discharge Protection: Extends battery lifespan by preventing deep discharge.
- Temperature Control Protection: Real-time monitoring to prevent overheating during operation.
8. Specifications
Key technical specifications of the BTS04 Series Battery Tester are as follows:
Figure 13: Technical Specifications Table.
| Attribute | Value |
|---|---|
| Brand Name | JUNCTEK |
| Model Number | BTS04 |
| Type | Household Battery Tester |
| DIY Supplies | Electrical |
| Battery Included | No |
| High-concerned chemical | None |
| Certification | CE, FCC, pse |
| Origin | Mainland China |
Package Dimensions:
- Length: 25 cm
- Width: 18 cm
- Height: 6 cm
- Weight: 0.56 kg
9. Maintenance
- Cleaning: Use a soft, dry cloth to clean the device. Avoid using abrasive cleaners or solvents.
- Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
- Liquid Contact: Do not expose the device to water or other liquids.
- Battery Care: Always remove batteries from the tester when not in use for extended periods.
10. Troubleshooting
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Inaccurate Resistance Readings:
- Ensure the battery is fully charged for the most accurate resistance readings.
- Insufficient voltage may cause abnormal resistance readings; recharge the battery before testing again.
- If using external wires for testing, direct connection is recommended for more accurate results as extension wires may cause measurement errors.
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Delayed Data Display:
- Data updates may have a slight delay during battery insertion or removal. Please check the readings after the data has stabilized.
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Battery Not Detected:
- Verify that the battery is inserted with correct polarity.
- Ensure the battery is compatible with the BTS04 tester.
11. User Tips
- Optimal Resistance Measurement: For the most accurate internal resistance readings, always ensure the battery is fully charged before initiating the test.
- Understanding Battery Variation: Be aware that each battery's internal resistance may differ slightly due to manufacturing tolerances and usage history. Always refer to the actual measurement for individual battery performance.
- Discharge Capacity as Key Metric: When evaluating battery performance, prioritize the discharge capacity as the main reference. This provides a more realistic assessment of the battery's usable energy.
- DIY Expansion: Utilize the expansion terminals for custom projects or to connect different battery fixtures, but remember to use direct connections for critical measurements to avoid errors from extension wires.
12. Warranty & Support
The JUNCTEK BTS04 Battery Charger & Tester is designed and manufactured to high-quality standards. For any technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact your retailer or the manufacturer's customer support directly. Please refer to your purchase documentation for specific warranty terms and contact information.
This product is certified with CE, FCC, and pse standards, ensuring compliance with relevant safety and quality regulations.
