1. Introduction
Thank you for choosing the YILANS JM4 Pro 42800mAh Portable Power Bank. This device is designed to provide reliable and fast charging for a wide range of electronic devices, including smartphones, tablets, and other USB-powered gadgets. Featuring a high-capacity battery, multiple output ports, and convenient built-in cables, it offers an all-in-one charging solution for travel, outdoor activities, and daily use. Please read this manual carefully to ensure proper use and optimal performance of your power bank.
2. Safety Information
To prevent injury or damage to your device, please observe the following safety precautions:
- Do not expose the power bank to extreme temperatures (above 60°C/140°F or below 0°C/32°F), direct sunlight, or fire.
- Avoid dropping, impacting, or disassembling the device.
- Keep the power bank away from water, moisture, and corrosive materials.
- Do not use the power bank if it is damaged, swollen, or leaking.
- Keep out of reach of children.
- Use only certified charging cables and adapters.
- Do not short-circuit the output ports.
- Dispose of the power bank responsibly according to local regulations.
3. Package Contents
Verify that all items are present in your package:
- 1 x YILANS 42800mAh Portable Charger with 4 built-in Cables and 3 Ports
- 1 x USB C Cable for Recharging Portable Charger
- 1 x User Manual (this document)
4. Product Overview
The YILANS JM4 Pro power bank features a sleek design with integrated cables and a digital display for convenience.
Image: The YILANS JM4 Pro Portable Power Bank, showcasing its reflective black finish, digital LED display indicating 100% charge, and integrated charging cables on the side.
Components:
- Digital LED Display: Shows the remaining battery percentage and charging status.
- Built-in Cables: Includes Type-C, iOS (Lightning), Micro USB, and USB-A cables for versatile device charging.
- Output Ports: Two USB-A ports and one bi-directional Type-C port for connecting external cables.
- Input Ports: The bi-directional Type-C port and a dedicated USB-A input cable (built-in) are used for recharging the power bank.
Image: A close-up view of the YILANS power bank highlighting its six output options (four built-in cables, two USB-A ports, one Type-C port) and two input options (Type-C port, built-in USB-A cable for recharging).
5. Specifications
| Feature | Description |
|---|---|
| Model Number | JM4 Pro |
| Battery Capacity | 42800 Milliamp Hours (mAh) |
| Product Dimensions | 5.61 x 2.88 x 1.12 inches (14.25 x 7.32 x 2.84 cm) |
| Item Weight | 1.21 pounds (548.8 g) |
| Input Ports | USB Type-C (bi-directional), Built-in USB-A cable |
| Output Ports | 2 x USB Type-A, 1 x USB Type-C (bi-directional) |
| Built-in Cables | Type-C, iOS (Lightning), Micro USB, USB-A (for input) |
| Fast Charging | 22.5W PD (Power Delivery) & QC3.0/4.0 (Quick Charge) |
| Special Features | Built-in Cables, Digital Display, Extra-large capacity, Fast Charging, Multiple safety protections, Pocket Size |
| Compatibility | iPhone 11-17 series, iPad series, Samsung S20-S23, Google Pixel, other Android smartphones, tablets, etc. |
6. Setup
6.1 Initial Charging of the Power Bank
Before first use, it is recommended to fully charge your YILANS JM4 Pro power bank. This ensures optimal battery performance and longevity.
- Locate the built-in USB-A input cable or the bi-directional Type-C port on the power bank.
- Connect the power bank to a suitable USB wall adapter (not included) or a computer's USB port using either the built-in USB-A cable or the provided USB-C to USB-C cable.
- The digital LED display will show the charging progress. The power bank is fully charged when the display shows "100%".
- Disconnect the power bank from the power source once fully charged.
Image: The YILANS power bank illustrating how it can be recharged using either its Type-C port or the built-in USB-A cable, connected to a wall adapter.
7. Operating Instructions
7.1 Charging Your Devices
The YILANS JM4 Pro offers multiple ways to charge your devices:
Using Built-in Cables:
- Identify the appropriate built-in cable (Type-C, iOS/Lightning, or Micro USB) for your device.
- Gently pull out the desired cable from its storage slot on the power bank.
- Connect the cable to your device's charging port.
- The power bank will automatically begin charging your device. The digital display will show the power bank's remaining charge.
Using External Cables (USB-A or Type-C Ports):
- Connect your device's charging cable to one of the USB-A output ports or the bi-directional Type-C port on the power bank.
- Connect the other end of your cable to your device.
- Charging will commence automatically.
7.2 Simultaneous Charging
The power bank supports charging up to 6 devices simultaneously using a combination of its built-in cables and external ports.
Image: The YILANS power bank connected to and simultaneously charging six different devices, including smartphones and a smartwatch, demonstrating its multi-device charging capability.
7.3 Understanding the LED Display
The digital LED display provides real-time information about the power bank's battery status:
- Percentage (%): Indicates the remaining battery charge level of the power bank.
- PD/QC Indicator: May light up to indicate that Power Delivery or Quick Charge fast charging protocols are active.
8. Maintenance
Proper maintenance ensures the longevity and performance of your power bank:
- Cleaning: Use a soft, dry cloth to wipe the surface of the power bank. Do not use liquid cleaners or abrasive materials.
- Storage: Store the power bank in a cool, dry place away from direct sunlight and extreme temperatures. If storing for extended periods, charge the power bank to approximately 50-75% every 3 months to maintain battery health.
- Cable Care: Ensure built-in cables are retracted properly when not in use to prevent damage. Avoid bending or twisting cables excessively.
9. Troubleshooting
If you encounter issues with your power bank, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Power bank not charging | Low battery, faulty cable/adapter, loose connection | Ensure power bank is connected securely. Try a different charging cable or wall adapter. |
| Device not charging from power bank | Power bank battery empty, faulty cable, incompatible device, loose connection | Check power bank's charge level. Ensure cable is securely connected to both power bank and device. Try a different cable or port. Verify device compatibility. |
| Slow charging | Non-fast charging cable/adapter, multiple devices charging, device not supporting fast charge | Use a fast-charging compatible cable and adapter. Disconnect other devices if faster charging is needed for one. Ensure your device supports fast charging protocols. |
| LED display not working | Power bank is completely discharged, internal fault | Attempt to charge the power bank. If the issue persists, contact customer support. |
If the problem persists after trying these solutions, please contact YILANS customer support.
10. Warranty and Support
YILANS provides a comprehensive warranty and customer support for its products. For specific warranty details, please refer to the warranty card included with your purchase or visit the official YILANS website.
Customer Support:
For technical assistance, troubleshooting, or warranty claims, please contact YILANS customer service through the following channels:
- Online: Visit the official YILANS website for FAQs and support contact information.
- Email: Refer to your product packaging or the YILANS website for the customer support email address.
Image: YILANS customer service representatives, illustrating the brand's commitment to support, with text highlighting 365-day return service and 24/7 availability.