EcoFlow RIVER Extra Battery

Name: EcoFlow RIVER Extra Battery
Brand: EcoFlow
Price: 179 USD
Availability: SoldOut

288 Wh, 5.5 lb, for the RIVER (original). $179 at EcoFlow, sold out when checked Oct 14, 2026: $0.62 for each watt-hour it adds.

Adds

288Wh

Price

$179

Per Wh added

$0.62

Each watt-hour it adds costs less than the RIVER (original)'s own ($1.21 on the RIVER (original)), 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 RIVER Extra Battery on each station
Station	Most per station	With one	With the most	Station and one battery
EcoFlow RIVER (original)288 Wh on its own	–	576 Wh	–	$528

Specs

EcoFlow RIVER Extra Battery: EcoFlow's figures
Capacity	288 Wh
Cells	not stated
Weight	5.5 lb (2.5 kg)
Cable, in the maker's words	not named on the page

Where these figures come from

EcoFlow product page: "288Wh (28.8V)" · "5.5 lbs (2.5kg)" · "Lithium-ion"
On the RIVER (original): EcoFlow's page, "What EcoFlow RIVER + Extra Battery Can Power?"
Price and stock: EcoFlow's US store, sold out when checked Oct 14, 2026.