Connect appliances to the station
Choose what has to keep running during a blackout — we will work out how long the station lasts and whether it can carry the load. Choose appliances — we will work out how long the station lasts.
An estimate: 85% of the station capacity (inverter efficiency) divided by the total power of the appliances; charge is shown after a 4-hour blackout. Real figures depend on how the appliances are used.
The EcoFlow DELTA Pro Smart Extra Battery is a 3600 Wh extra battery for the EcoFlow DELTA Pro power station. It connects to the station’s expansion port and doubles its reserve: together you get 7.2 kWh, and with two batteries up to 10.8 kWh. If you want to buy EcoFlow DELTA Pro Smart Extra Battery, the main thing to know is that it has no sockets of its own: it works only together with the station and charges through it.
Inside are lithium iron phosphate (LFP) cells. According to EcoFlow, the battery lasts 3500 cycles to 80% capacity and 6500 cycles to 50%. For a home where the station works as a backup every day, that is around ten years of normal use.
Why the DELTA Pro Smart Extra Battery
3600 Wh added to the station you already have
DELTA Pro itself holds 3600 Wh. An extra battery of the same capacity doubles the reserve without buying a second station. EcoFlow points out that expanding with a battery costs up to 30% less than a station of the same capacity, because the battery has no inverter, sockets or station control display.
Up to two batteries per station
DELTA Pro has two ports for extra batteries. With one battery the system holds 7.2 kWh, with two it reaches 10.8 kWh according to EcoFlow’s US page. EcoFlow’s European page states 10.6 kWh, so plan on 10.6-10.8 kWh.
Charges together with the station
The battery uses every charging method DELTA Pro has: mains, solar panels, car, EV charging stations and the Smart Generator. Once connected, the station and the battery charge and discharge together, like a single battery. According to EcoFlow, by combining mains, solar and the generator, a DELTA Pro system with a battery accepts up to 6500 W.
Control in the app
Smart in the name means the battery’s status shows in the EcoFlow app: charge level, temperature and energy flow. The battery needs no separate setup; the station detects it automatically once connected.
Wheels and handle
The battery weighs about 38 kg and measures 63.5 x 28.5 x 41.6 cm. Like DELTA Pro, it stands on wheels and has a telescopic handle, so you do not have to carry it.
Compatible power stations
- EcoFlow DELTA Pro – the main station for this battery, up to two batteries at once. EcoFlow’s European page states plainly that the battery is designed for DELTA Pro.
- EcoFlow DELTA Pro 3 – in the FAQ on the DELTA Pro 3 page, EcoFlow confirms that the DELTA Pro battery can be connected to it. The manufacturer warns that because the DELTA Pro and DELTA Pro 3 batteries have different capacities, there may be some imbalance in the charge level between units.
This battery does not fit DELTA 2, DELTA 3 or RIVER. For DELTA Pro 3 the more natural choice is the EcoFlow DELTA Pro 3 Smart Extra Battery with 4096 Wh, and the extra batteries section will help you find a battery for another station.
How much energy 3600 Wh gives
Usable energy is a little below the rating because of losses in the station’s inverter; in practice it is around 85-90%. Approximate figures for one battery together with the DELTA Pro station, that is 7.2 kWh:
- a fridge using 1-1.5 kWh per day – more than four days;
- a router and lighting at 50 W – several days non-stop;
- a gas boiler with a circulation pump at 100-150 W – two to three days;
- a 60 W laptop – more than a hundred hours.
This is an estimate for planning your reserve, not a guaranteed run time: real consumption depends on your devices and the temperature.
Who it is for
- DELTA Pro owners for whom 3.6 kWh is not enough for long power cuts.
- A private home where the station powers the boiler, fridge, pump and lighting.
- A motorhome or van: in EcoFlow’s camper example the daily consumption is 4 kWh, and the system’s 7.2 kWh lasts about two days.
- A system with solar panels where there is surplus energy in the day that you want to store for the night.
Specifications
| Parameter | Value |
|---|---|
| Capacity | 3600 Wh |
| Battery type | LFP (LiFePO4) |
| Cycle life | 3500 to 80% capacity, 6500 to 50% |
| Weight | approx. 38 kg |
| Dimensions | 63.5 x 28.5 x 41.6 cm |
| Compatibility | DELTA Pro (up to 2 batteries), DELTA Pro 3 |
| Charging without a station | Smart Generator only |
| App | EcoFlow, monitoring and control |
| Manufacturer warranty | 3 years + 2 years after registration |
In the box
- EcoFlow DELTA Pro Smart Extra Battery.
- User manual and warranty card.
EcoFlow also sells the DELTA Pro Extra Battery Cable (0.75 m) separately. We will confirm whether it is in the box for a particular batch when you place your order.
Tips for use
Place the battery next to the station on a level floor, in a dry room out of direct sunlight. Connect the battery to the station while the station is off, then switch the system on. Do not keep the system fully discharged for long, and during long storage top it up every few months. Update the station firmware through the app so the battery works with all features.
Frequently asked questions
Can the battery be charged without the station?
Only from the EcoFlow Smart Generator. All other charging methods – mains, solar and car – work when the battery is connected to DELTA Pro.
How many batteries can I connect?
Two to DELTA Pro. Together with the station that is 10.6-10.8 kWh, depending on which EcoFlow specification you take.
Does it fit DELTA Pro 3?
Yes, EcoFlow confirms it, but warns about a possible charge-level imbalance because of the different capacities. If you are buying a battery specifically for DELTA Pro 3, the DELTA Pro 3 Smart Extra Battery makes more sense.
Does it work as a standalone power bank?
No. The battery has no sockets or USB; only the station delivers its energy.
The manufacturer warranty on the EcoFlow DELTA Pro Smart Extra Battery under the EcoFlow Europe policy is 3 years plus 2 more years after registration in the app, with service handled by EcoFlow in the EU. To buy EcoFlow DELTA Pro Smart Extra Battery, place an order on the website: we ship by Nova Poshta across Ukraine, and you can pay on delivery.
