EcoFlow DELTA Pro Smart Extra Battery

Name: EcoFlow DELTA Pro Smart Extra Battery
Brand: EcoFlow
Price: 1199 USD
Availability: SoldOut

3,600 Wh of LiFePO4, 84 lb, for the DELTA Pro and DELTA Pro 3. $1,199 at EcoFlow, sold out when checked Oct 14, 2026: $0.33 for each watt-hour it adds. With the 2 EcoFlow allows, the DELTA Pro holds 10,800 Wh in all.

Adds

3,600Wh

Price

$1,199

Per Wh added

$0.33

Each watt-hour it adds costs less than the stations' own ($0.53 on the DELTA Pro and $0.68 on the DELTA Pro 3), so it is the cheaper way to more stored energy than a second station, which adds outlets and output instead.

From EcoFlow's published figures and our own arithmetic; we have not tested it ourselves.

See it at EcoFlow Extra batteries for every station

Which stations take it

The most one station takes is EcoFlow's figure; a dash where its page gives none. Prices are both makers' prices added up, before cables.

EcoFlow DELTA Pro Smart Extra Battery on each station
Station	Most per station	With one	With the most	Station and one battery
EcoFlow DELTA Pro3,600 Wh on its own	2	7,200 Wh	10,800 Wh	$3,098
EcoFlow DELTA Pro 34,096 Wh on its own	–	7,696 Wh	–	$3,998

Specs

EcoFlow DELTA Pro Smart Extra Battery: EcoFlow's figures
Capacity	3,600 Wh
Cells	LiFePO4
Weight	84 lb (38 kg)
Cable, in the maker's words	not named on the page

Where these figures come from

EcoFlow product page: "3600Wh" · "Approx. 84lbs / 38kg" · "With its upgraded LFP battery chemistry, the DELTA Pro Smart Extra Battery has a lifespan of 3000 complete cycles until it reduces to 80% capacity."
On the DELTA Pro: EcoFlow's page, "DELTA Pro supports 2 extra batteries."
On the DELTA Pro 3: EcoFlow's page, "The EcoFlow DELTA Pro Smart Extra Battery is compatible with the EcoFlow DELTA Pro 3."
Price and stock: EcoFlow's US store, sold out when checked Oct 14, 2026.