Welcome
This user manual provides essential information for the safe and efficient operation of your YILANS JM4 Pro 50000mAh Portable Power Bank. Please read this manual thoroughly before use and retain it for future reference.
Product Features
- Built-in 4 cables (Type-C, iOS, Micro-USB output, USB-A input) for universal compatibility.
- Additional ports: 1 USB-C (In & Out), 2 USB-A outputs.
- Total of 6 output ports and 2 input ports.
- High capacity 50000mAh battery.
- 22.5W PD (Power Delivery) and QC (Quick Charge) 3.0/4.0 fast charging technology.
- Precision LED digital display for real-time power status.
- Multiple safety protections: overcharge, overvoltage, overcurrent, short-circuit, overheating.
- Compact and portable design.
Package Contents
- 1 x YILANS JM4 Pro 50000mAh Power Bank
- 1 x USB-C Charging Cable
- 1 x User Manual
Device Layout
The YILANS JM4 Pro Power Bank features a sleek design with integrated cables and multiple ports for versatile charging. The built-in cables are neatly stored within the device when not in use.
Image: Front view of the YILANS JM4 Pro Power Bank, highlighting the built-in USB-A input, Type-C output, iOS output, and Micro-USB output cables. The top edge shows additional USB-A output ports and a USB-C input/output port.
The device includes:
- Built-in Cables: USB-A (input), Type-C (output), iOS (output), Micro-USB (output).
- External Ports: 2 x USB-A Output, 1 x USB-C Input/Output.
- LED Display: Located on the front surface, showing battery percentage and charging status.
- Power Button: On the side, to activate the LED display.
Initial Activation
For optimal performance on first use, please follow these steps:
- Fully drain the power bank's battery until it turns off.
- Recharge the power bank to 100% using a suitable power adapter (not included) and the provided USB-C cable or the built-in USB-A input cable.
- During activation, avoid powering off or unplugging the adapter to prevent inaccurate LED display readings.
Image: Visual guide for activating the power bank, illustrating the process of draining the battery to 0% and then fully recharging it to 100% for accurate LED display calibration.
Checking Battery Level
Press the power button located on the side of the power bank once to activate the LED digital display. The display will show the remaining battery percentage. If fast charging (PD) is active, it will also indicate "PD".
Video: A user demonstrating the digital display of the YILANS JM4 Pro power bank, showing the battery percentage and "PD" indicator when fast charging is active.
Charging the Power Bank
You can recharge your YILANS JM4 Pro Power Bank using two methods:
- Using the Built-in USB-A Input Cable: Connect the built-in USB-A cable to a compatible USB wall adapter (not included) or a computer's USB port.
- Using the USB-C Input Port: Connect a USB-C cable (included) to the power bank's USB-C input/output port and a compatible USB-C wall adapter (not included).
Image: Illustration showing the two methods for recharging the power bank: using the built-in USB-A cable connected to a wall adapter, and using a separate USB-C cable connected to a wall adapter.
Charging External Devices
The YILANS JM4 Pro Power Bank offers multiple options to charge your devices:
- Built-in Cables: Utilize the integrated Type-C, iOS, or Micro-USB output cables to directly connect to your compatible devices.
- USB-A Output Ports: Use your device's own USB-A charging cable and plug it into one of the two USB-A output ports on the power bank.
- USB-C Input/Output Port: For devices compatible with USB-C, use a USB-C to USB-C cable (not included) to connect to the power bank's versatile USB-C port.
The power bank can charge up to 6 devices simultaneously, making it ideal for sharing power with friends and family or charging multiple personal devices at once.
Image: The YILANS JM4 Pro power bank actively charging six different electronic devices, demonstrating its multi-device charging capability.
Video: A detailed review of the YILANS JM4 Pro 50000mAh Power Bank, showcasing its built-in cables and ability to charge multiple devices simultaneously.
Fast Charging Technology
Equipped with PD 3.0 and QC 3.0/4.0 technology, the YILANS JM4 Pro Power Bank delivers rapid charging speeds. For example, it can charge an iPhone 17 up to 55% in just 30 minutes.
Image: A visual comparison demonstrating the fast charging capability of the YILANS JM4 Pro, showing it charges an iPhone 17 to 55% in 30 minutes, significantly faster than other chargers.
Important Safety Precautions
The YILANS JM4 Pro Power Bank is designed with multiple built-in security features and a premium chip to ensure the safety of your devices and the power bank itself. These protections include:
- Over-current protection
- Over-voltage protection
- Over-power protection
- Short-circuit protection
- Temperature protection (overheating protection)
- Anti-interference protection
Image: An exploded view diagram of the power bank highlighting its internal safety mechanisms, including protections against over-voltage, over-current, overheating, short-circuit, and overcharge.
Always ensure proper usage and avoid exposing the device to extreme temperatures, moisture, or physical impact.
Cleaning and Storage
- To clean the power bank, use a soft, dry cloth. Avoid using harsh chemicals or abrasive materials.
- Store the power bank in a cool, dry place away from direct sunlight and extreme temperatures.
- When storing for extended periods, ensure the power bank has at least a 50% charge to prolong battery life.
Common Issues and Solutions
- Q: What should I do when I receive the power bank?
- A: Please activate the LED screen display of the power bank by fully draining it and then fully recharging it to 100%.
- Q: Why can't the power bank be fully charged?
- A: Ensure you are using a compatible power adapter and cable. If it's the first use, complete the initial activation cycle (drain to 0%, then charge to 100%).
- Q: Why does the power bank take a long time to fully charge?
- A: The charging speed depends on the power adapter used. For faster charging, use a PD or QC compatible adapter. Also, ensure the power bank is not simultaneously charging other devices while being recharged itself.
Image: Visual guide for activating the power bank, illustrating the process of draining the battery to 0% and then fully recharging it to 100% for accurate LED display calibration. This process can resolve initial charging discrepancies.
Technical Specifications
| Feature | Specification |
|---|---|
| Model Number | JM4 Pro |
| Battery Capacity | 50000mAh |
| Product Dimensions | 5.61 x 2.88 x 1.12 inches |
| Item Weight | 1.14 pounds |
| USB-C Input/Output | 22.5W PD |
| USB-A Output | 22.5W (Max) |
| Built-in Cables Output | Type-C, iOS, Micro-USB |
| Built-in Cable Input | USB-A |
Warranty Information
Your YILANS JM4 Pro Portable Power Bank comes with a 24-month warranty from the date of purchase. We also provide lifetime technical support for our products. For any issues or inquiries, please contact our customer service team.
Image: Customer support information, highlighting 365-day return service and 24/7 technical support availability.
