Introduction
Thank you for choosing the ROMOSS LT20 20000mAh Power Bank. This manual provides essential information for the safe and efficient use of your device. Please read it thoroughly before use and retain it for future reference.
The ROMOSS LT20 is a high-capacity portable charger featuring an updated digital LED display for precise battery percentage indication. It offers versatile charging with three input ports (Micro USB, Lightning, and USB-C) and two USB output ports, allowing you to charge multiple devices simultaneously.
Product Overview
Familiarize yourself with the components and features of your ROMOSS LT20 Power Bank.

Image Description: An overhead view of the ROMOSS LT20 Power Bank, highlighting its various ports and features with numbered labels. The labels indicate: 1. Laser Radium Carving Process, 2. Single-run Injection Molding, 3. LED Display, 4. Sandblast Surface, 5. Power Button, 6. Micro USB input, 7. Lightning input, 8. Type-C Input, 9. Dual USB outputs.
- Digital LED Display: Shows the remaining battery percentage.
- Multiple Input Ports: Micro USB, Lightning, and USB-C for convenient recharging of the power bank.
- Dual USB Output Ports: Allows charging of two devices simultaneously.
- High Capacity: 20000mAh provides multiple charges for most smartphones and tablets.
Setup
Before first use, it is recommended to fully charge your ROMOSS LT20 Power Bank.
- Initial Charge: Connect the power bank to a power source (e.g., wall adapter, computer USB port) using one of the compatible input cables (Micro USB, Lightning, or USB-C).
- Monitor Charging: The digital LED display will show the charging progress. It will display "100" when fully charged.
- Cable Compatibility: The power bank is designed to be compatible with various charging cables for its input ports.

Image Description: A visual representation of the three input types supported by the power bank: Apple Lightning, Android Type-C, and Android Micro USB, demonstrating its broad compatibility for recharging.
Operating Instructions
Charging Your Devices
- Connect Device: Use your device's original USB charging cable to connect it to one of the two USB output ports on the power bank.
- Initiate Charging: The power bank will automatically detect and begin charging your device. The LED display will show the power bank's remaining charge.
- Charge Multiple Devices: You can charge two devices simultaneously using both USB output ports.
- Charging Completion: Your device will indicate when charging is complete. Disconnect the device from the power bank.

Image Description: The ROMOSS LT20 Power Bank is shown connected via USB cables to two different smartphones, demonstrating its ability to charge two devices at once.
Checking Battery Level
Press the power button once to activate the digital LED display, which will show the current battery percentage of the power bank.

Image Description: A hand holding the ROMOSS LT20 Power Bank, with its digital LED display clearly showing "100", indicating a full charge.
Maintenance
- Keep the power bank away from water, moisture, and extreme temperatures.
- Avoid dropping or subjecting the power bank to strong impacts.
- Clean the power bank with a dry, soft cloth. Do not use harsh chemicals or abrasive materials.
- Store the power bank in a cool, dry place when not in use for extended periods.
- For optimal battery life, fully charge the power bank at least once every three months if not used regularly.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Power bank not charging |
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| Device not charging from power bank |
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| LED display not working |
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Specifications
| Feature | Detail |
|---|---|
| Brand | ROMOSS |
| Model Number | LT20 |
| Battery Capacity | 20000mAh |
| Battery Cell Composition | Lithium Polymer |
| Input Ports | Micro USB, Lightning, USB-C |
| Output Ports | 2 x USB-A (2.1A max per port) |
| Current Rating (Output) | 2.1 Amps |
| Special Feature | Digital LED Display |
| Color | White |
| Dimensions | 21 x 10.4 x 2.6 cm |
| Weight | 530 grams |
Warranty and Support
The ROMOSS LT20 Power Bank comes with a limited warranty. Please refer to the warranty card included in your product packaging for specific terms and conditions.
For technical support, troubleshooting assistance, or warranty claims, please contact ROMOSS customer service. Contact information can typically be found on the official ROMOSS website or on the product packaging.
Online Resources: For additional information and FAQs, visit the official ROMOSS Store on Amazon.





