GENSROCK CK25200

GENSROCK Portable Charger Power Bank 20000mAh - User Manual

Model: CK25200

1. Product Overview

The GENSROCK Portable Charger Power Bank 20000mAh, Model CK25200, is designed to provide reliable and fast charging for your electronic devices on the go. Featuring a high-capacity 20000mAh battery and 35W ultra-fast charging capabilities, it ensures your devices stay powered throughout your travels or daily use. This power bank includes multiple output ports for simultaneous charging and incorporates advanced safety features.

GENSROCK 35W Fast Charging Power Bank with digital display and connected phone

Image 1.1: The GENSROCK Portable Charger Power Bank featuring 35W fast charging and a digital display.

2. Setup and Initial Use

2.1 Charging the Power Bank

Before first use, fully charge your GENSROCK power bank. Connect a compatible USB-C charging cable to one of the power bank's USB-C input/output ports and connect the other end to a wall adapter (not included). The digital LED display will show the charging progress, indicating 100% when fully charged.

2.2 Checking Battery Level

The integrated digital LED display shows the remaining battery percentage. Briefly press the power button to activate the display and check the current charge level.

Close-up of the GENSROCK power bank's precision digital LED display showing 100% charge

Image 2.1: Precision digital LED display for real-time power tracking.

3. Operating Instructions

3.1 Charging Your Devices

To charge a device, connect it to one of the power bank's output ports using an appropriate charging cable. The power bank features:

  • Dual 35W USB-C Ports (Input/Output): For fast charging compatible devices and recharging the power bank itself.
  • One 5V/3A USB-A Port (Output): For standard charging of various devices.

The power bank will automatically detect the connected device and begin charging. The digital display will show the power bank's remaining charge.

GENSROCK power bank simultaneously charging a smartphone, tablet, and wireless earbuds

Image 3.1: The power bank's three output ports allow for simultaneous charging of multiple devices.

3.2 Fast Charging Capabilities

The 35W USB-C ports support Power Delivery 3.0 and Quick Charge 4.0 protocols, enabling ultra-fast charging for compatible devices. For example, an iPhone can charge from 0% to 60% in approximately 30 minutes.

GENSROCK power bank charging various devices including iPhone, Samsung, iPad, and MacBook Air

Image 3.2: The 20000mAh capacity provides multiple charges for smartphones, tablets, and laptops.

4. Maintenance

  • Cleaning: Use a soft, dry cloth to clean the power bank. Avoid using harsh chemicals or abrasive materials.
  • Storage: Store the power bank in a cool, dry place away from direct sunlight and extreme temperatures. For long-term storage, it is recommended to charge the power bank to about 50-75% every three months to preserve battery health.
  • Avoid Drops: Protect the device from drops and impacts, which can damage internal components.

5. Troubleshooting

5.1 Power Bank Not Charging

  • Ensure the charging cable is securely connected to both the power bank and the wall adapter.
  • Verify that the wall adapter is functioning correctly and providing sufficient power (e.g., a 35W or higher USB-C PD adapter for optimal charging).
  • Try a different charging cable or wall adapter.

5.2 Device Not Charging from Power Bank

  • Check if the power bank has sufficient charge. The LED display should show a percentage above 0%.
  • Ensure the charging cable connecting your device to the power bank is functional and properly connected.
  • Confirm your device is compatible with the power bank's output ports (USB-C or USB-A).
  • Some devices may require a specific charging protocol; ensure your device supports Power Delivery or Quick Charge for fast charging.

5.3 Slow Charging

  • Ensure you are using a fast-charging compatible cable and your device supports fast charging protocols (PD, QC).
  • Charging multiple devices simultaneously may reduce the charging speed for individual devices.
  • Environmental factors like extreme temperatures can affect charging efficiency.

6. Specifications

FeatureDetail
Model NameCK25200
Battery Capacity20000mAh
Connector TypeUSB Type A, USB Type C
Number of Ports3 (2x USB-C, 1x USB-A)
Max Output Power35W
Voltage5 Volts
Battery Cell TypeLithium Ion
Item Dimensions (L x W x Thickness)7.2" x 1.1" x 4.25"
Special FeaturesDigital Display, Portable, Travel Charger, Lightweight, 90% high conversion
ManufacturerDongguan Chenrui New Energy Technology Co., LTD.

7. Safety Information and Guidelines

The GENSROCK Portable Charger Power Bank is designed with multiple safety certifications (FCC, CE, UN38.3, ROHS, UL) and advanced protection features to ensure safe operation:

  • Overcharge Protection: Prevents the battery from being overcharged.
  • Over-Discharge Protection: Protects against excessive discharge.
  • High-Temperature Protection: Monitors and regulates internal temperature.
  • Over-Current Protection: Safeguards against excessive current flow.
  • Short-Circuit Protection: Prevents damage from short circuits.
  • Voltage Spike Protection: Protects against sudden voltage fluctuations.

7.1 General Safety Precautions

  • Do not expose the power bank to water, moisture, or extreme temperatures.
  • Avoid disassembling, puncturing, or modifying the device.
  • Keep out of reach of children.
  • Dispose of the power bank responsibly according to local regulations.

7.2 Air Travel Compliance

This power bank complies with air transport standards, making it suitable for carrying on board aircraft. Always check with your airline for their specific regulations regarding portable power banks before traveling.

Man using the GENSROCK power bank to charge his phone on an airplane, indicating it's travel-friendly

Image 7.1: The GENSROCK power bank is compliant with air transport standards for carry-on luggage.

8. Warranty and Customer Support

The GENSROCK Portable Charger Power Bank CK25200 comes with a 12-month warranty from the date of purchase. This warranty covers manufacturing defects and issues arising from normal use.

For any questions, concerns, or technical support, please contact GENSROCK customer service. We offer lifetime customer support to assist you with your product.

Contact Information: Please refer to the packaging or the official GENSROCK website for the most up-to-date customer support contact details.

© 2026 GENSROCK. All rights reserved.

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