1. Introduction
Thank you for choosing the RONEGN Portable Charger Power Bank 40000mAh, Model GN4. This device is designed to provide reliable and fast charging for your electronic devices on the go. Please read this manual carefully to ensure proper use and to maximize the lifespan of your power bank.
2. Safety Information
Important Safety Warnings:
- Do not disassemble, open, or shred the battery pack.
- Do not expose the power bank to heat or fire. Avoid storage in direct sunlight.
- Do not short-circuit the battery.
- Do not expose the power bank to mechanical shock.
- In case of battery leakage, do not allow the liquid to come into contact with skin or eyes. If contact occurs, wash the affected area with water and seek medical advice.
- Keep the power bank clean and dry.
- Do not use the power bank if it has been damaged or modified.
- Dispose of the power bank according to local regulations.
- Important Note: 40000mAh portable chargers are generally NOT ALLOWED on airplanes due to aviation safety regulations regarding lithium-ion battery capacity. Please check with your airline before travel.
The RONEGN GN4 includes a comprehensive multi-protection safety system to prevent overcharge, over-discharge, over-voltage, short circuits, and high temperatures, ensuring safe operation for your devices.
3. Package Contents
Please check the box for the following items:
- RONEGN Portable Charger Power Bank 40000mAh
- USB to USB C Cable
- User Manual (this document)
4. Product Overview
The RONEGN GN4 Power Bank features multiple ports for versatile charging and a built-in flashlight for convenience.

Image 4.1: Front view of the RONEGN Power Bank, highlighting the USB-C Input/Output, Micro USB Input, 2x USB Output ports, LED indicator lights, and the integrated flashlight.

Image 4.2: Two RONEGN Power Banks, illustrating the compact design and the illuminated LED indicators and flashlight on one unit.
4.1. Ports and Indicators
- USB-C Port (Input/Output): Supports 22.5W fast charging output and 20W fast charging input.
- Micro USB Port (Input): For charging the power bank.
- USB-A Ports (Output x2): For charging external devices.
- LED Indicators: Four white LED lights indicate the remaining power (each light represents 25%). A fifth green LED light indicates fast charging status.
- Power Button: Activates the power bank and flashlight.
- Flashlight: Built-in high-brightness flashlight.
5. Setup
5.1. Initial Charging of the Power Bank
Before first use, it is recommended to fully charge your RONEGN Power Bank. This ensures optimal battery performance.
- Connect the provided USB to USB C cable to the power bank's USB-C input port.
- Connect the other end of the cable to a USB wall charger (not included).
- The LED indicators will illuminate to show the charging progress. When all four white LEDs are solid, the power bank is fully charged. The green LED will light up if fast charging is active.
6. Operating Instructions
6.1. Charging External Devices
The RONEGN Power Bank can charge up to three devices simultaneously.

Image 6.1: The RONEGN Power Bank connected to and charging three different electronic devices simultaneously.
- Connect your device's charging cable to one of the power bank's output ports (USB-A or USB-C).
- The power bank will automatically begin charging your device. The LED indicators will show the remaining power. If your device supports fast charging and is connected to the USB-C port, the green LED will illuminate.
- Disconnect your device once charging is complete. The power bank will automatically turn off after a period of inactivity.
6.2. Checking Battery Level
Press the power button once to check the remaining battery level. The white LED indicators will light up:
- 1 LED: 0-25% remaining
- 2 LEDs: 25-50% remaining
- 3 LEDs: 50-75% remaining
- 4 LEDs: 75-100% remaining
A green LED indicates that fast charging is active (either charging the power bank or an external device).
6.3. Using the Flashlight
- To turn on the flashlight, double-press the power button.
- To turn off the flashlight, double-press the power button again.
7. Specifications
| Model | GN4 |
| Battery Capacity | 40000mAh |
| USB-C Input | 20W Max |
| Micro USB Input | Standard Charging |
| USB-C Output | 22.5W Max |
| USB-A Output (x2) | Standard Charging |
| Dimensions | 5 x 3 x 1 inches |
| Weight | 1.04 pounds |
| Battery Type | Lithium Polymer |
8. Maintenance
- Clean the power bank with a soft, dry cloth. Do not use harsh chemicals or abrasive materials.
- Store the power bank in a cool, dry place away from direct sunlight and extreme temperatures.
- Avoid dropping or subjecting the power bank to strong impacts.
- If not used for extended periods, charge the power bank at least once every three months to maintain battery health.
9. Troubleshooting
9.1. Power Bank Not Charging
- Ensure the charging cable is securely connected to both the power bank's input port and the wall charger.
- Try a different charging cable or wall adapter.
- Verify the wall outlet is functional.
9.2. Devices Not Charging from Power Bank
- Ensure the power bank has sufficient charge (check LED indicators).
- Verify the charging cable is securely connected to both the power bank's output port and your device.
- Try a different charging cable or output port.
- Press the power button once to ensure the power bank is active.
9.3. Flashlight Not Working
- Ensure the power bank has sufficient charge.
- Double-press the power button firmly to activate/deactivate the flashlight.
If issues persist, please contact customer support.
10. Warranty and Support
The RONEGN Portable Charger Power Bank comes with 2 years of support. If you encounter any quality issues or require assistance, please contact our customer service team directly. We aim to respond within 24 hours.
For further assistance, please refer to the contact information provided with your purchase or visit the official RONEGN website.


