1. Introduction
Thank you for choosing the Yard Force Powerbank AC 20000 mAh. This portable power station is designed to provide reliable power for a wide range of electronic devices, including smartphones, tablets, laptops, and other AC-powered appliances. With its high capacity and versatile output options, it is an ideal companion for travel, outdoor activities, and emergency situations. Please read this manual carefully before using the product to ensure safe and optimal operation.
2. Safety Instructions
To prevent damage to the device or injury to yourself and others, observe the following safety precautions:
- Do not expose the power bank to extreme temperatures, direct sunlight, or fire.
- Do not immerse the power bank in water or other liquids.
- Avoid dropping, hitting, or disassembling the device. Unauthorized repairs can void the warranty and pose safety risks.
- Keep out of reach of children.
- Ensure proper ventilation when in use to prevent overheating.
- Use only approved chargers and cables for charging the power bank.
- If the power bank swells, emits smoke, or shows other abnormalities, discontinue use immediately.
- Do not insert foreign objects into the ports.
3. Package Contents
Verify that all items are present in your package:
- Yard Force Powerbank AC 20000 mAh (Model LX PB74)
- USB-C Charging Cable
- User Manual
4. Product Overview
Familiarize yourself with the components of your Yard Force Powerbank.

Image 4.1: Front view of the Yard Force Powerbank AC 20000 mAh, showing its compact design and LED indicator lights.
- LED Indicator Lights: Display the remaining battery level and charging status.
- Power Button: Activates the power bank and checks battery status.
- USB-A Output Port: For charging USB-A compatible devices.
- USB-C Input/Output Port: For charging the power bank or charging USB-C compatible devices.
- AC Output Port: For powering AC-compatible devices (e.g., laptops, small fans).
5. Setup: Initial Charging
Before first use, fully charge your Yard Force Powerbank.
- Connect the provided USB-C charging cable to the power bank's USB-C port.
- Connect the other end of the USB-C cable to a compatible USB wall adapter (not included) or a power source.
- The LED indicator lights will illuminate to show the charging progress. All lights will be solid when fully charged.
- Charging time may vary depending on the power source.
6. Operating Instructions
6.1. Charging Devices via USB
The power bank features both USB-A and USB-C output ports for charging mobile devices.

Image 6.1: A person working on a laptop outdoors, powered by the Yard Force Powerbank, demonstrating its portability and utility for mobile computing.
- Press the power button once to activate the power bank.
- Connect your device's charging cable to the appropriate USB-A or USB-C output port on the power bank.
- The power bank will automatically begin charging your device.
- You can charge up to three devices simultaneously using the USB-A, USB-C, and AC outputs.
6.2. Using the AC Output
The AC output allows you to power small appliances and laptops.

Image 6.2: The Yard Force Powerbank providing power to a table lamp, illustrating its capability to run AC-powered devices for extended periods.
- Press and hold the power button for approximately 3 seconds to activate the AC output. An indicator light for AC will illuminate.
- Plug your AC-powered device into the AC output port.
- Ensure the device's power consumption does not exceed the power bank's maximum AC output (refer to specifications).
- To turn off the AC output, press and hold the power button again for 3 seconds.
6.3. Emergency and Outdoor Use
The power bank is designed for portability and can be used in various scenarios.

Image 6.3: The power bank positioned beside a lamp, with text indicating estimated usage times for various devices like smartphones, laptops, and lamps, highlighting its utility in emergency situations.

Image 6.4: The compact power bank securely placed in the side pocket of a hiking backpack, demonstrating its lightweight and portable design for outdoor adventures.
- Its compact size (6.5 x 6.5 x 15.5 cm) and light weight (670.5 g) make it suitable for carrying in backpacks or bags.
- Ideal for camping, hiking, long trips, or as a backup power source during outages.
7. Charging the Power Bank
To recharge the power bank:
- Connect a USB-C charging cable to the power bank's USB-C port.
- Connect the other end of the cable to a suitable power source, such as a wall adapter, car charger, or solar panel (accessories sold separately).
- The LED indicators will show the charging status. A full charge is indicated when all LEDs are solid.
8. Maintenance
Proper maintenance ensures the longevity of your power bank:
- Clean the exterior with a soft, dry cloth. Do not use harsh chemicals or abrasive materials.
- 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 50-75% every 3-6 months to maintain battery health.
- Avoid fully discharging the battery frequently, as this can reduce its lifespan.
9. Troubleshooting
If you encounter issues with your power bank, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Power bank not charging | Charging cable or adapter faulty; USB-C port dirty; power bank fully charged. | Try a different cable/adapter. Clean the USB-C port. Check LED indicators. |
| Device not charging from power bank | Power bank off; low battery; device cable faulty; incompatible device. | Press power button. Recharge power bank. Try a different cable. Check device compatibility. |
| AC output not working | AC output not activated; device exceeds power limit; power bank low battery. | Press and hold power button for 3 seconds to activate AC. Check device wattage. Recharge power bank. |
| Power bank overheating | Overload; poor ventilation; environmental temperature too high. | Disconnect devices. Move to a cooler, well-ventilated area. Reduce load. |
10. Specifications
| Feature | Detail |
|---|---|
| Model Name | LX PB74 |
| Battery Capacity | 20000 mAh / 74.4 Wh |
| Battery Composition | Lithium-ion |
| Input (USB-C) | USB Type C (Specifications may vary, refer to product label) |
| Output (USB-A) | USB Type A (Specifications may vary, refer to product label) |
| Output (USB-C) | USB Type C (Specifications may vary, refer to product label) |
| Output (AC) | AC Output (Specifications may vary, refer to product label) |
| Voltage | 20 Volts (DC) |
| Dimensions | 6.5 x 6.5 x 15.5 cm |
| Weight | 670.5 g |
| Color | Black |
| Special Feature | Portable |
| Recommended Uses | Camera, Drone, Camera Flash, GPS, MP3 Player, Game Controller, PC, Radio, Tablet, Phone, Photographic Lighting |
11. Warranty and Support
Yard Force products are manufactured to high-quality standards. For warranty information, technical support, or customer service inquiries, please refer to the contact details provided with your purchase documentation or visit the official Yard Force website. Please retain your proof of purchase for warranty claims.





