1. Introduction
This manual provides essential information for the safe and effective use of your eufy Accessory-Replacement Battery, designed specifically for the eufy Omni S1 Pro and S1 robot vacuum cleaners. This genuine eufy accessory ensures optimal performance and extends the lifespan of your device.

Image: The eufy Accessory-Replacement Battery, showing its compact design and connector cable.
2. Safety Information
Please read and understand all safety warnings before handling or installing the battery. Failure to follow these instructions may result in fire, electric shock, or other injuries.
- Do Not Short Circuit: Avoid contact between the battery terminals and metal objects.
- Do Not Expose to Heat or Fire: Keep the battery away from high temperatures, direct sunlight, and open flames.
- Do Not Disassemble: Do not attempt to open or modify the battery pack.
- Proper Disposal: Dispose of used batteries according to local regulations. Do not dispose of with household waste.
The eufy replacement battery is equipped with comprehensive safety features for enhanced reliability:

Image: Diagram illustrating the battery's built-in protections: Short Circuit Protection, Overvoltage Protection, Overheat Protection, and Overcurrent Protection.
3. Compatibility
This replacement battery is specifically designed for and compatible with the following eufy robot vacuum models:
- eufy Omni S1 Pro
- eufy Omni S1

Image: The eufy replacement battery with text indicating compatibility with eufy S1 Pro and eufy S1 robot vacuums.

Image: A eufy Omni S1 Pro robot vacuum, illustrating the type of device this battery is designed for.
4. Installation Guide
Follow these steps to replace the battery in your eufy Omni S1 Pro or S1 robot vacuum:
- Power Off: Ensure your robot vacuum is powered off and disconnected from its charging station.
- Access Battery Compartment: Carefully turn the robot vacuum upside down. Locate the battery cover, typically secured by screws.
- Remove Old Battery: Unscrew the battery cover and remove it. Gently unlatch the connector of the old battery from the robot's port and lift the old battery out.
- Insert New Battery: Take the new eufy replacement battery. Insert it into the compartment with the sticker side facing up.
- Connect Battery: Carefully align the battery connector with the port inside the robot vacuum and push firmly until it clicks into place.
- Tuck Wires: Ensure the battery wires are neatly tucked inside the compartment to prevent pinching or damage when closing the cover.
- Secure Cover: Replace the battery cover and secure it with the screws.
- Initial Charge: Place the robot vacuum back on its charging station to allow the new battery to fully charge before its first use.
5. Battery Care and Maintenance
To maximize the lifespan and efficiency of your eufy replacement battery, consider the following:
- Regular Replacement: It is recommended to replace the battery approximately every 6 months to maintain optimal cleaning efficiency of your robot vacuum.
- Avoid Extreme Temperatures: Do not expose the battery or the robot vacuum to extremely high or low temperatures.
- Proper Storage: If the robot vacuum will not be used for an extended period, fully charge the battery before storing it in a cool, dry place.
- Use Genuine Accessories: Always use authentic eufy accessories to ensure compatibility and extend the lifespan of your machine.
6. Specifications
Key technical specifications for the eufy Accessory-Replacement Battery:

Image: Visual representation of the battery's key specifications including voltage, capacity, and type.
| Specification | Value |
|---|---|
| Model Number | T29J4 |
| Battery Type | Lithium-Ion |
| Battery Voltage | 21.6V |
| Battery Capacity | 4,600 mAh (99.36Wh) |
| Item Weight | 1.21 pounds |
| Package Dimensions | 4.45 x 3.27 x 2.32 inches |
| Suggested Change Frequency | Annually (or every 6 months for optimal efficiency) |
7. Troubleshooting
If you encounter issues after replacing the battery, consider the following common solutions:
- Robot Not Powering On: Ensure the battery connector is fully and securely plugged into the robot's port. Double-check that the battery wires are not pinched.
- Short Run Time: Allow the new battery to undergo several full charge and discharge cycles to optimize its performance. Ensure the robot's charging contacts are clean.
- Charging Issues: Verify that the robot vacuum is correctly placed on its charging station and that the station is receiving power.
If problems persist, please refer to the main instruction manual for your eufy Omni S1 Pro/S1 robot vacuum or contact customer support.
8. Customer Support
For further assistance, technical support, or warranty inquiries, please contact eufy customer service. You can find contact information and additional resources on the official eufy website or through the eufy store on Amazon.
Visit the official eufy store: eufy Store on Amazon





