1. Introduction
This manual provides essential instructions for the safe and efficient use of your Litheli 20V 4.0Ah U20 Series Portable Outdoor Battery (Model: U20BY03-0J000). This mobile battery is designed for compatibility with all Litheli U20 series electrical products, as well as various portable devices such as smartphones and tablets. Please read this manual thoroughly before operation and retain it for future reference.
Product Overview

Figure 1: Litheli 20V 4.0Ah U20 Series Portable Outdoor Battery.
Key Features
- Dimensions: 15D x 10W x 5H cm
- Weight: 550g
- Capacity: 20000mAh
- Input/Output: Type-C, Type-A
- Compatibility: Fully compatible with Litheli U20 series electrical products, smartphones, and tablets.
- Portability: Compact design suitable for travel and outdoor use, airline carry-on possible.
2. Important Safety Instructions
Failure to follow these safety instructions may result in fire, electric shock, or injury.
- Do not disassemble, open, or shred the battery pack.
- Do not expose the battery pack to heat or fire. Avoid storage in direct sunlight.
- Do not short-circuit a battery pack. Do not store battery packs haphazardly in a box or drawer where they may short-circuit each other or be short-circuited by conductive materials.
- Do not remove a battery pack from its original packaging until required for use.
- Do not subject battery packs to mechanical shock.
- In the event of battery leakage, do not allow the liquid to come into contact with the skin or eyes. If contact has been made, wash the affected area with copious amounts of water and seek medical advice.
- Keep battery packs clean and dry.
- Do not use any charger other than that specifically provided for use with the equipment.
- Observe the plus (+) and minus (-) marks on the battery and equipment and ensure correct use.
- Keep out of reach of children.
- Seek medical advice immediately if a battery pack has been swallowed.
- Dispose of properly according to local regulations.
3. Package Contents
Upon opening the package, please verify that all items are present and undamaged:
- Litheli 20V 4.0Ah U20 Series Portable Outdoor Battery (Model: U20BY03-0J000)
- USB Charging Cable (Type-C to Type-A)
- User Manual (This document)
4. Setup and Charging
Initial Charge
- Connect the provided USB charging cable to the battery's Type-C input port.
- Connect the other end of the USB cable (Type-A) to a compatible USB power adapter (not included) or a powered USB port.
- The battery's indicator lights will show the charging status. Charge the battery fully before first use.
Connecting to Litheli U20 Series Products
For Litheli U20 series tools, insert the battery pack into the designated battery slot until it clicks securely into place. Refer to your specific Litheli tool's manual for detailed instructions on battery insertion.
5. Operation
Charging External Devices
The Litheli U20 Series Portable Outdoor Battery can charge various devices via its Type-C and Type-A output ports.

Figure 2: Illustrates the charging capacity of the U20 battery for various electronic devices.
- Connect your device's charging cable to the appropriate output port (Type-C or Type-A) on the Litheli battery.
- Ensure your device is compatible with the battery's output specifications.
- The battery will automatically begin charging your device. Monitor your device's charging indicator.
Battery Level Indicator
The battery features LED indicators to display the remaining charge level. Refer to the markings on the battery for specific indicator meanings (e.g., number of lights indicating charge percentage).
6. Maintenance and Storage
- Keep the battery clean and dry. Wipe with a soft, dry cloth if necessary.
- Store the battery in a cool, dry place away from direct sunlight, heat sources, and moisture.
- For long-term storage, charge the battery to approximately 50-70% capacity and recharge every 3-6 months to prevent deep discharge.
- Avoid storing the battery in extreme temperatures (hot or cold) as this can reduce its lifespan.
7. Troubleshooting
Battery Not Charging
- Ensure the charging cable is securely connected to both the battery and the power source.
- Verify that the power source is active and providing power.
- Try using a different USB cable or power adapter to rule out cable/adapter issues.
- Check the battery for any visible damage.
Device Not Charging from Battery
- Ensure the battery has sufficient charge.
- Verify that your device's charging cable is securely connected to both the battery and your device.
- Confirm that your device is compatible with the battery's output specifications.
- Try using a different charging cable for your device.
If problems persist, please contact Litheli customer support.
8. Specifications
| Attribute | Value |
|---|---|
| Product Model Number | U20BY03-0J000 |
| Product Weight | 600 g |
| Package Dimensions | 16 x 11.5 x 4.8 cm |
| Battery Type | Lithium Ion |
| Battery Voltage | 20 Volts |
| Battery Capacity | 20000 mAh |
| Manufacturer | Litheli |
| Country of Origin | China |
9. Warranty and Support
Litheli products are designed and manufactured to the highest quality standards. For warranty information, technical support, or service inquiries, please refer to the warranty card included with your product or visit the official Litheli website. Please have your product model number (U20BY03-0J000) and purchase date available when contacting support.
For additional information, you may visit the Litheli Store on Amazon.





