Add 3,600Wh of energy storage to your original EcoFlow DELTA Pro for longer runtime between charges.
EcoFlow DELTA Pro Smart Extra Battery
Keep your existing DELTA Pro working for longer. The DELTA Pro Smart Extra Battery expands your stored energy without replacing your power station—useful when you need more time between charging opportunities.
Connect one extra battery for 7,200Wh total nominal capacity, or two for 10,800Wh. The power station remains the hub for running your appliances.
3,600Wh Extra Storage
LFP Battery
Original DELTA Pro Expansion
Built-In LCD
Extra battery only: This is not a standalone power station and has no household AC outlets. It is the original DELTA Pro Smart Extra Battery—not the DELTA Pro 3 Extra Battery. Confirm compatibility before ordering for another model.
Longer Runtime
Increase your energy reserve for the appliances you already run from your DELTA Pro. Actual runtime depends on the load, battery condition and operating conditions.
Expand in Stages
Add one battery now and a second later if your needs grow. Build storage around your usage rather than replacing the whole setup.
Shared Charging
When connected to the DELTA Pro, the extra battery charges and discharges as part of the system. Charging accessories depend on your chosen energy source.
Clear Battery Information
The built-in LCD displays battery status. EcoFlow app monitoring is also available through the supported system connection.
🔧 What’s Included
- 1 × EcoFlow DELTA Pro Smart Extra Battery
- 1 × DELTA Pro Extra Battery Cable
- Handle cover
- User manual
DELTA Pro power station, solar panels, generator and additional charging accessories are not included.
🔋 Choose Your Storage Capacity
| Configuration |
Total Nominal Capacity |
| DELTA Pro alone |
3,600Wh |
| DELTA Pro + one Smart Extra Battery |
7,200Wh |
| DELTA Pro + two Smart Extra Batteries |
10,800Wh |
Adding batteries increases stored energy, not the power station’s continuous AC output. Nominal battery capacity is not the same as usable AC energy delivered to appliances.
⚡ Charging Your Extra Battery
For normal mains and solar charging, connect the extra battery to your DELTA Pro first. The power station then manages charging across the connected system.
Direct charging from a compatible EcoFlow Smart Generator is also supported with the required connection equipment. Generator, cables and adapters must be checked for the exact models being used and are not included unless expressly listed.
Charging time depends on the energy source, starting charge levels, temperature and any appliances running at the same time. Additional battery capacity takes longer to replenish at the same charging power.
Planning several accessories? Battery expansion and accessories such as an alternator charger can use the DELTA Pro’s expansion connections. Contact us to check the complete cable and port arrangement before purchasing.
🏕️ When Is an Extra Battery Useful?
- You have enough output power but need longer runtime.
- You want more stored energy for overnight essentials.
- You have fewer opportunities to recharge while travelling.
- You want to expand an existing DELTA Pro setup gradually.
Extra storage does not generate electricity. For regular off-grid use, your charging supply must still replenish the energy you consume.
📊 Technical Specifications
| Product |
Original DELTA Pro Smart Extra Battery |
| Nominal capacity |
3,600Wh |
| Battery chemistry |
LFP (lithium iron phosphate) |
| Rated cycle life |
3,500 cycles to at least 80% capacity under specified test conditions |
| Weight |
Approximately 38kg |
| Dimensions |
635 × 285 × 416mm |
| Charging temperature |
0°C to 45°C |
| Discharging temperature |
−10°C to 45°C |
| Status display |
Built-in LCD |
| Standalone AC outlets |
None |
Frequently Asked Questions
Can I plug appliances directly into this battery?
No. Appliances connect to the DELTA Pro power station. This battery adds energy storage to the connected system.
Will it increase the power available for appliances?
It increases runtime, not the DELTA Pro’s continuous AC output. You still need to keep appliance loads within the power station’s limits.
Is this the battery for the DELTA Pro 3?
No. This is the original DELTA Pro Smart Extra Battery. The DELTA Pro 3 Extra Battery is a different product. Contact us before ordering if you are unsure which battery your setup needs.
Can I charge it from a wall socket or solar panel directly?
Not directly. For these charging methods, connect it to the DELTA Pro and use the power station’s supported charging inputs.
How long will the expanded system run?
That depends on what you power and for how long. Share your appliance wattages and expected usage with us, and we can help estimate a suitable storage capacity.
How should I store it when not in use?
Follow the current EcoFlow manual for storage charge level, temperature and periodic maintenance. Do not leave the battery fully discharged for an extended period.
Need help checking compatibility?
Contact us with your exact power station model and existing accessories before ordering.
