1. Product Overview
The NOBIS 65W 20000mAh Portable Charger (Model N2931) is a high-capacity power bank designed for fast and efficient charging of various electronic devices. It features multiple ports, a digital display, and advanced safety protections.

Image: The NOBIS 65W 20000mAh Portable Charger, showcasing its design and available colors.
Key Features:
- 65W Fast Charging: Supports bidirectional fast charging (65W max output, 45W max input) with PD/QC protocols. Capable of charging a laptop to 45% in 30 minutes and fully recharging itself in 1.5 hours.
- 20000mAh Large Capacity: Provides extended power for daily use and travel, capable of charging a smartphone 3-4 times, a tablet 2-3 times, and a laptop once.
- 4-Port Simultaneous Charging: Equipped with two USB-A and two USB-C ports, allowing simultaneous charging of up to four devices.
- Digital Display & Low-current Mode: Features a clear digital display for remaining power and a low-current mode for stable charging of sensitive devices like earbuds and smartwatches.
- Multi-layer Safety Protection: Built-in protections against over-charge, over-discharge, over-voltage, over-current, short-circuit, and temperature fluctuations.
2. Safety Information
Please read and understand all safety instructions before using this product to prevent injury or damage.
- Do not expose the power bank to extreme temperatures (above 60°C/140°F or below 0°C/32°F).
- Avoid dropping, disassembling, or attempting to repair the device yourself.
- Keep away from water, moisture, and flammable materials.
- Use only certified charging cables and adapters.
- Dispose of the power bank according to local regulations for electronic waste.
- Do not use if the power bank is swollen, leaking, or damaged.
3. Setup
Package Contents:
Verify that all items are present in the package:
- NOBIS 20000mAh/65W Power Bank (1 unit)
- 3A Type-C to Type-C charging cable (30cm) (1 unit)
- Instruction Manual (1 unit)
Product Diagram:
Familiarize yourself with the ports and indicators on your power bank.

Image: Close-up view of the power bank's digital display, indicating a full charge (100%).
- USB-C Ports (Input/Output): Two USB-C ports support both charging the power bank and charging other devices.
- USB-A Ports (Output): Two USB-A ports for charging various devices.
- Digital Display: Shows the remaining battery percentage.
4. Operating Instructions
Charging the Power Bank:
- Connect the provided USB-C to USB-C cable to one of the USB-C input ports on the power bank.
- Connect the other end of the cable to a compatible USB-C wall charger (not included) with a minimum 45W output for optimal charging speed.
- The digital display will show the charging status and current battery percentage. The power bank will be fully recharged in approximately 1.5 hours with a 45W input.
Charging Devices:
- Connect your device's charging cable to an available USB-A or USB-C output port on the power bank.
- Connect the other end of the cable to your device.
- The power bank will automatically begin charging your device. The digital display will show the remaining battery level.
- For low-current devices (e.g., earbuds, smartwatches), the power bank automatically adjusts to a stable low-current output to protect the device's battery.

Image: A person holding the NOBIS power bank, illustrating its compact and portable design for on-the-go use.
5. Maintenance
- Cleaning: Use a soft, dry cloth to clean the surface of the power bank. Do not use liquid cleaners or abrasive materials.
- Storage: Store the power bank in a cool, dry place away from direct sunlight and extreme temperatures. For long-term storage, charge the power bank to approximately 50-75% every three months to maintain battery health.
- Handling: Handle the power bank with care. Avoid dropping or subjecting it to strong impacts.
6. Troubleshooting
Power Bank Not Charging:
- Ensure the charging cable is securely connected to both the power bank and the wall charger.
- Verify that the wall charger is functioning correctly and provides sufficient power (minimum 45W recommended for fast charging).
- Try a different USB-C cable or wall charger.
Device Not Charging from Power Bank:
- Check if the power bank has sufficient charge.
- Ensure the charging cable is securely connected to both the power bank and your device.
- Try a different port on the power bank.
- Try a different charging cable for your device.
Digital Display Not Working:
- If the display is completely off, the power bank might be fully discharged. Try charging it.
- If the display is erratic, contact customer support.
7. Specifications
| Feature | Specification |
|---|---|
| Model Number | N2931 |
| Battery Capacity | 20000 mAh |
| Max Output Power | 65W |
| Max Input Power | 45W |
| Input Ports | 2 x USB Type-C |
| Output Ports | 2 x USB Type-C, 2 x USB Type-A |
| Product Dimensions | 13.7 x 7 x 2.63 cm |
| Item Weight | 400 g |
| Special Features | Auto Shut-Off, Digital Display, Fast Charging, Over Charging Protection, Short Circuit Protection |
| Battery Type | Nonstandard Battery (included) |
| Color | Blue |
8. Warranty and Support
NOBIS products come with a standard manufacturer's warranty. For detailed warranty information, please refer to the warranty card included with your product or visit the official NOBIS website.
Customer Support:
If you encounter any issues or have questions regarding your NOBIS 65W 20000mAh Portable Charger, please contact our customer support team:
- Email: support@nobis.com (Example)
- Website: www.nobis.com (Example)
Please have your model number (N2931) and purchase details ready when contacting support.
