1. Introduction
This manual provides essential instructions for the safe and efficient operation of your Eco Play 3600 Pro-Extra Battery. This unit is designed as an expandable battery to increase the capacity of the Eco Play 3600 Pro main power station, providing reliable power for various applications, from home backup to outdoor activities. Please read this manual thoroughly before use and retain it for future reference.

Image: The Eco Play 3600 Pro-Extra Battery, a grey and black unit with wheels and a handle.
2. Safety Instructions
To ensure safe operation, always follow these precautions:
- Do not expose the unit to rain or moisture.
- Do not disassemble, repair, or modify the unit.
- Keep the unit away from heat sources, open flames, and flammable materials.
- Ensure proper ventilation during use to prevent overheating.
- Use only specified cables and accessories provided by Eco Play.
- This extra battery unit (SYD3600-Extra) cannot be used alone; it must be connected to an Eco Play 3600 Pro main power station.
- Keep out of reach of children and pets.
3. Package Contents
Verify that all items are present in your package:
- Eco Play 3600 Pro-Extra Battery Unit (1)
- Parallel Port Cable (1)
- MC4-XT60 Cable (1)
- User's Manual (1)

Image: Contents of the Eco Play 3600 Pro-Extra package, showing the battery unit, parallel cable, MC4-XT60 cable, and user manual.
4. Product Overview
4.1 Key Features
- Expandable Capacity: Connects to the 3600 Pro main unit to expand total capacity up to 11,520Wh with two extra batteries.
- LiFePO4 Battery: Equipped with a 3,840Wh LiFePO4 battery, offering over 4000+ charge/discharge cycles and a lifespan of 10+ years.
- Portability: Features integrated casters and a handle for easy transport. Includes an organizer on top for cable storage.
- Battery Management System (BMS): Provides comprehensive protection against high/low temperature, overvoltage, overload, overcharge, short circuit, and overcurrent.

Image: Diagram illustrating how one 3600 Pro main unit combined with one 3600 Pro Extended Battery achieves 7680Wh, and with two extended batteries achieves 11520Wh.

Image: The Eco Play 3600 Pro-Extra battery unit showing its top storage compartment and integrated wheels for portability.
4.2 Specifications
| Specification | Value |
|---|---|
| Brand | Eco Play |
| Model Name | 3600 Pro-Extra Battery |
| Capacity | 3840Wh |
| Battery Type | LiFePO4 |
| Lifespan | 4000+ charge/discharge cycles |
| Product Dimensions (L x W x H) | 27.3" x 15.9" x 23" (55cm x 32.1cm x 46.4cm) |
| Weight | Approx. 37 kg |
| Compatibility | Eco Play 3600 Pro Portable Power Station |

Image: Visual representation of the Eco Play 3600 Pro-Extra dimensions and a table summarizing its key specifications.
5. Setup
The Eco Play 3600 Pro-Extra battery is designed to expand the capacity of your Eco Play 3600 Pro main power station. It cannot operate independently.
- Positioning: Place the 3600 Pro-Extra battery unit next to your 3600 Pro main power station on a stable, flat surface. Ensure adequate ventilation around both units.
- Connecting the Parallel Cable: Locate the expansion ports on both the 3600 Pro main unit and the 3600 Pro-Extra battery.
- Insert one end of the provided Parallel Port Cable into the expansion port of the 3600 Pro main unit.
- Securely insert the other end of the Parallel Port Cable into the expansion port of the 3600 Pro-Extra battery. Ensure the connection is firm.
- Power On: Once connected, power on the 3600 Pro main unit. The system will automatically recognize the connected extra battery, and the combined capacity will be displayed on the main unit's screen.

Image: Three Eco Play power stations, demonstrating how the main unit can be flanked by two extended batteries to achieve maximum capacity.
6. Operating Instructions
The 3600 Pro-Extra battery functions as an extension of the 3600 Pro main unit. All charging, discharging, and output controls are managed through the main power station.
- Charging: Charge the entire system (main unit + extra battery) by connecting the 3600 Pro main unit to an AC outlet or solar panels using the appropriate cables. The extra battery will charge in conjunction with the main unit.
- Discharging: When devices are connected to the 3600 Pro main unit, power will be drawn from the combined battery capacity.
- Monitoring: Monitor the battery level and power flow via the display on the 3600 Pro main unit or through the Eco Play smart app.
Note: The rated output and other performance characteristics of the 3600 Pro main unit will not change, only the total energy capacity is increased by connecting the extra battery.
7. Maintenance
Proper maintenance ensures the longevity and optimal performance of your Eco Play 3600 Pro-Extra battery.
- Storage: If storing the unit for an extended period, ensure it is charged to approximately 50-80% capacity. Recharge every 3-6 months to prevent deep discharge. Store in a cool, dry place, away from direct sunlight and extreme temperatures.
- Cleaning: Use a dry, soft cloth to clean the exterior of the unit. Do not use liquid cleaners or immerse the unit in water.
- Battery Health: The LiFePO4 battery is designed for long life. Avoid consistently draining the battery to 0% or charging to 100% if not necessary for immediate use, as this can slightly extend overall cycle life.
8. Troubleshooting
If you encounter issues, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Extra battery not recognized by main unit. | Loose parallel cable connection. | Ensure the Parallel Port Cable is securely connected to both the main unit and the extra battery. |
| Extra battery not charging. | Main unit not charging or not powered on. | Verify the 3600 Pro main unit is properly connected to a power source and is powered on. Check the parallel cable connection. |
| Unusual noises or smells. | Internal malfunction. | Immediately power off the main unit and disconnect the extra battery. Contact customer support. |
For further assistance, please contact Eco Play customer support.
9. Warranty and Support
Eco Play products are backed by a manufacturer's warranty. Please refer to the warranty card included in your package or visit the official Eco Play website for detailed warranty terms and conditions.
For technical support, service, or warranty claims, please contact Eco Play customer service through their official channels. Provide your product model number (3600 Pro-Extra Battery) and purchase information when contacting support.
Eco Play Official Website: Visit Eco Play Store on Amazon





