1. Important Safety Instructions
Please read these safety instructions carefully before using the goobay Power Bank 53939. Failure to follow these instructions may result in fire, electric shock, injury, or damage to the product or property.
- Do not disassemble, open, or attempt to repair the power bank.
- Do not expose the power bank to water, moisture, or extreme temperatures (above 45°C or below 0°C).
- Keep the power bank away from direct sunlight, heat sources, and flammable materials.
- Do not drop, puncture, or apply excessive force to the power bank.
- Use only certified charging cables and adapters.
- Keep out of reach of children.
- Dispose of the power bank responsibly according to local regulations. Do not dispose of it with household waste.
2. Product Overview
2.1 Package Contents
- goobay Power Bank 53939 (20000 mAh)
- USB Charging Cable
- User Manual
2.2 Device Layout and Features
The goobay Power Bank 53939 is a high-capacity portable charger designed for fast and efficient charging of your mobile devices. It features multiple ports and an LED display for battery status.

Image 1: Front view of the goobay Power Bank 53939, showing the LED display indicating 100% charge. The device has a sleek, dark gray finish.
- LED Display: Shows the precise battery percentage of the power bank.
- USB-C Port (Input/Output): Supports Power Delivery (PD) for fast charging the power bank itself and compatible devices.
- USB-A Ports (Output): Two ports supporting Quick Charge (QC 3.0) for rapid charging of compatible devices.
- Power Button: Activates the LED display and initiates charging.

Image 2: Side view of the goobay Power Bank 53939, illustrating its dimensions (140 mm height, 69 mm width, 27.5 mm depth) and weight (374g). The image highlights its compact design.
3. Setup
3.1 Charging the Power Bank
Before first use, fully charge your goobay Power Bank 53939.
- Connect the provided USB charging cable (or a compatible USB-C cable) to the USB-C port on the power bank.
- Connect the other end of the cable to a USB wall charger (not included) or a computer's USB port. For fastest charging, use a USB-C Power Delivery compatible charger.
- The LED display will show the current charge percentage. It will indicate 100% when fully charged.
Charging time varies depending on the power source. A full charge can take several hours.
4. Operating Instructions
4.1 Charging External Devices
The power bank can charge smartphones, tablets, GPS devices, cameras, MP3 players, and other USB-powered devices.
- Press the power button once to activate the power bank and check its battery level on the LED display.
- Connect your device's charging cable to one of the USB-A output ports or the USB-C input/output port on the power bank.
- Connect the other end of the cable to your device.
- Charging should begin automatically. If not, press the power button again.
- The power bank will automatically turn off when the connected device is fully charged or disconnected, or after a period of inactivity.
For optimal fast charging, ensure your device and cable support Quick Charge 3.0 (for USB-A) or Power Delivery (for USB-C).
4.2 Checking Battery Level
Press the power button once. The LED display will illuminate and show the remaining battery percentage of the power bank.
5. Maintenance
Proper maintenance ensures the longevity and optimal performance of your power bank.
- 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. If storing for extended periods, charge the power bank to approximately 50-70% every three months to maintain battery health.
- Avoid Over-Discharging: Do not allow the power bank to completely discharge for prolonged periods, as this can reduce battery life.
6. Troubleshooting
If you encounter issues with your goobay Power Bank 53939, refer to the following common solutions:
- Power bank not charging:
- Ensure the charging cable is securely connected to both the power bank's USB-C input and the power source.
- Try a different USB-C cable or wall adapter.
- Verify the power source is active.
- Device not charging from power bank:
- Press the power button on the power bank to activate it.
- Ensure the charging cable is securely connected to both the power bank and your device.
- Try a different charging cable or a different output port on the power bank.
- Check if your device's charging port is clean and free of debris.
- Ensure the power bank has sufficient charge.
- Slow charging:
- Ensure both your device and the cable support fast charging standards (QC 3.0 or PD).
- Some devices may limit charging speed when in use.
- LED display not working:
- Press the power button firmly.
- If the power bank is completely discharged, the display may not light up until it receives some charge.
If the problem persists, please contact goobay customer support.
7. Specifications
| Model | 53939 |
| Brand | goobay |
| Battery Capacity | 20000 mAh |
| Battery Composition | Lithium-polymer |
| Input (USB-C) | USB-C Power Delivery (PD) |
| Output (USB-A) | Quick Charge 3.0 (QC 3.0) |
| Output (USB-C) | USB-C Power Delivery (PD) |
| Connectors | USB Type A, USB Type C |
| Voltage | 5 Volts |
| Color | Black |
| Weight | 374 Grams |
| Dimensions (L x W x D) | 140 mm x 69 mm x 27.5 mm (approximate) |
| Special Feature | Fast Charge |
8. Warranty and Support
The goobay Power Bank 53939 comes with a standard manufacturer's warranty. Please refer to the warranty card included in your package or visit the official goobay website for detailed warranty terms and conditions.
For technical support, troubleshooting assistance, or warranty claims, please contact goobay customer service through their official website or the contact information provided with your purchase.







