Product Overview
The ROMOSS PEA40 Power Bank is a high-capacity portable charger designed to keep your devices powered on the go. With its robust 40,000mAh capacity and 18W fast charging capabilities, it provides reliable power for multiple devices.
- 18W Fast Charging: Supports Quick Charge (QC) to rapidly charge up to three devices simultaneously at a maximum speed of 3 amps.
- Versatile Connectivity: Features three output ports (USB-C, USB-A x2) and two input ports (Micro USB, USB-C) for broad compatibility and flexible charging options.
- Wide Device Compatibility: Compatible with a broad range of devices including smartphones (iPhone, Android), tablets (iPad), smartwatches, and other USB-powered electronics.
- Massive Capacity: The impressive 40,000mAh battery ensures extended power supply, ideal for travel, work, or outdoor activities.
- Safety Guaranteed: Undergoes rigorous safety testing and certifications to ensure secure and reliable charging for both the power bank and your devices.
Product Features

Figure 1: Overview of the ROMOSS PEA40 Power Bank's input and output ports, including USB-C, Micro USB, and dual USB-A ports.
The PEA40 is equipped with multiple ports to cater to various charging needs:
- USB-C Port: Functions as both an input and output, supporting fast charging for compatible devices.
- Micro USB Input: Dedicated input port for charging the power bank.
- Dual USB-A Output: Two standard USB-A ports for charging a wide range of devices.

Figure 2: The digital LED screen provides real-time information on battery percentage, current, and voltage during charging.
A clear digital LED screen on the power bank displays the exact power percentage remaining, along with current and voltage information when the power button is pressed. This allows for easy monitoring of the power bank's status.
Setup
Charging the Power Bank
Before first use, it is recommended to fully charge your ROMOSS PEA40 Power Bank. You can charge it using either the USB-C input port or the Micro USB input port.
- Connect a compatible USB wall adapter (not included) to a power outlet.
- Connect the appropriate charging cable (USB-C to USB-C or Micro USB to USB-A) to the power bank's input port.
- The digital LED display will show the charging progress. A full charge from 0% may take several hours due to the large capacity.

Figure 3: The USB-C port on the power bank supports both input for charging the power bank and output for charging devices.
Operating Instructions
Charging Your Devices
The ROMOSS PEA40 Power Bank can charge up to three devices simultaneously using its multiple output ports.
- Connect your device's charging cable to one of the power bank's output ports (USB-C, USB-A 1, or USB-A 2).
- The power bank will automatically begin charging your device. If it doesn't, press the power button once to activate charging.
- The digital display will show the remaining battery percentage of the power bank.

Figure 4: The power bank allows for simultaneous charging of up to three devices, ideal for sharing power or charging multiple gadgets at once.
Checking Battery Level
Press the power button once to view the current battery percentage on the digital LED display. The display will turn off automatically after a few seconds to conserve power.
Maintenance
To ensure the longevity and optimal performance of your ROMOSS PEA40 Power Bank, follow these maintenance guidelines:
- Storage: Store the power bank in a cool, dry place away from direct sunlight and extreme temperatures.
- Cleaning: Use a soft, dry cloth to clean the surface of the power bank. Avoid using harsh chemicals or abrasive materials.
- Charging Cycles: For optimal battery health, avoid completely draining the power bank before recharging. Regular partial charges are recommended.
- Avoid Impacts: Protect the power bank from drops and strong impacts, which can damage internal components.
Troubleshooting
If you encounter issues with your ROMOSS PEA40 Power Bank, refer to the following common troubleshooting tips:
- Power Bank Not Charging:
- Ensure the charging cable and wall adapter are working correctly. Try a different cable or adapter.
- Check if the input port on the power bank is clean and free of debris.
- Device Not Charging from Power Bank:
- Press the power button once to ensure the power bank is active.
- Try a different output port on the power bank.
- Ensure your device's charging cable is securely connected and functional.
- Verify your device is compatible with the power bank's output specifications.
- Slow Charging:
- Ensure both the power bank and your device support fast charging protocols (e.g., QC 3.0, PD).
- Use a high-quality, fast-charging compatible cable.
- Charging multiple devices simultaneously may reduce individual charging speeds.
- Digital Display Not Working:
- Press the power button firmly.
- If the power bank is completely drained, the display may not light up until it receives some charge.
Specifications
| Feature | Detail |
|---|---|
| Brand | ROMOSS |
| Model Number | PEA40 |
| Battery Capacity | 40,000 mAh |
| Product Dimensions | 6.69 x 3.19 x 1.73 inches |
| Item Weight | 2.1 pounds |
| Connector Type | USB Type C, Micro USB, USB Type A |
| Special Features | Digital Display, Auto Shut-Off, Fast Charging |
| Color | Black - 18W |
| Manufacturer | ROMOSS |
| Country of Origin | China |
| Date First Available | June 10, 2020 |
Warranty and Support
For product support, warranty information, or to access the official user manual in PDF format, please visit the ROMOSS Store on Amazon or refer to the included documentation.
Additional protection plans may be available for purchase, offering extended coverage beyond the standard manufacturer's warranty. Please check Amazon product page for details.







