1. Introduction
Thank you for choosing the Romoss Simple 20 20000mAh Power Bank. This device is designed to provide reliable portable power for your electronic devices. Please read this manual carefully before use to ensure proper operation and to maximize the lifespan of your power bank.

Image: The Romoss Simple 20 Power Bank, showcasing its compact design, multiple input/output ports, and LED charge indicators.
2. Safety Instructions
- Do not expose the power bank to extreme temperatures, direct sunlight, or fire.
- Do not immerse the power bank in water or other liquids.
- Avoid dropping or subjecting the power bank to strong impacts.
- Do not attempt to disassemble, repair, or modify the power bank. This will void the warranty and may cause safety hazards.
- Keep out of reach of children.
- Use only certified charging cables and adapters.
- If the power bank swells, emits an odor, or becomes excessively hot, discontinue use immediately.
- Dispose of the power bank responsibly according to local regulations.
3. Package Contents
Please check the package for the following items:
- Romoss Simple 20 20000mAh Power Bank
- USB Charging Cable (Micro USB or USB-C, depending on model batch)
- User Manual

Image: The retail box of the Romoss Simple 20 Power Bank, indicating its capacity and features.
4. Product Features
- High Capacity: 20000mAh battery for extended device charging.
- Fast Charging: Supports 5V 2.1A charging for efficient power delivery.
- Simultaneous Charging: Capable of charging two devices concurrently.
- Versatile Input Ports: Equipped with Lightning, Micro USB, and Type-C input ports for convenient recharging.
- Dual Output Ports: Features dual USB-A and one Type-C output ports for broad compatibility.
- LED Indicators: Four LED lights provide real-time feedback on the power bank's remaining battery level.

Image: The Romoss Simple 20 Power Bank connected to and charging multiple electronic devices, demonstrating its versatility.
5. Setup: Charging the Power Bank
Before using your Romoss Simple 20 Power Bank for the first time, it is recommended to fully charge it.
- Connect to Power Source: Use a compatible charging cable (Lightning, Micro USB, or Type-C) and connect it to one of the input ports on the power bank.
- Plug into Adapter: Connect the other end of the cable to a USB wall adapter (not included) or a computer's USB port.
- Monitor Charging: The LED indicators will light up to show the charging status. During charging, the LEDs will blink, and once fully charged, all four LEDs will remain solid.
A full charge may take several hours due to the high capacity of the power bank.

Image: A close-up view of the Romoss Simple 20 Power Bank's input and output ports, including Lightning, Micro USB, Type-C, and dual USB-A.
6. Operating: Using the Power Bank
To charge your electronic devices using the Romoss Simple 20 Power Bank:
- Connect Device: Use your device's original charging cable or a certified compatible cable. Connect one end to your device and the other end to one of the USB-A or Type-C output ports on the power bank.
- Initiate Charging: The power bank will automatically detect your device and begin charging. The LED indicators will show the remaining battery level of the power bank.
- Simultaneous Charging: You can charge up to two devices simultaneously using the available output ports.
- Check Battery Level: Press the power button once to check the current battery level indicated by the LEDs.

Image: The Romoss Simple 20 Power Bank actively charging both a smartphone and a tablet, demonstrating its dual-device charging capability.
7. Maintenance
- Cleaning: Use a soft, dry cloth to clean the surface of the power bank. Do not use harsh chemicals or abrasive materials.
- Storage: Store the power bank in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery Care: For optimal battery health, fully charge and discharge the power bank at least once every three months if not in regular use.
- Avoid Over-Discharge: Do not allow the power bank to completely drain for extended periods.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Power bank not charging | Loose cable connection, faulty cable/adapter, power bank fully charged. | Ensure cables are securely connected. Try a different cable or wall adapter. Check LED indicators; if all are solid, it's fully charged. |
| Device not charging from power bank | Power bank is empty, loose cable connection, incompatible cable, device issue. | Recharge the power bank. Ensure cables are securely connected. Try a different cable. Check if your device charges with other power sources. |
| Slow charging | Low power adapter, faulty cable, device's charging input limit. | Use a 5V/2.1A (or higher) wall adapter for faster charging. Try a different cable. Some devices have slower charging limits. |
| LED indicators not working | Power bank is completely discharged, internal fault. | Try charging the power bank for an extended period. If problem persists, contact customer support. |
9. Specifications
| Feature | Detail |
|---|---|
| Model Number | PSL20-101-1134 |
| Battery Capacity | 20000mAh |
| Battery Cell Type | Lithium Ion |
| Input Ports | Lightning, Micro USB, USB Type-C |
| Output Ports | Dual USB-A, USB Type-C |
| Voltage | 5 Volts |
| Item Weight | 0.4 Kilograms |
| Item Dimensions (L x W x T) | 12 x 7 x 2.5 centimetres |
| Special Feature | LED Indicator Lights |
10. Warranty and Support
This Romoss Simple 20 Power Bank comes with a Limited Warranty. Please refer to the warranty card included in your package for specific terms and conditions.
For technical support, troubleshooting assistance, or warranty claims, please contact Romoss customer service through their official website or the retailer where you purchased the product. Keep your purchase receipt as proof of purchase.