EcoFlow RIVER 3 Plus Extra Battery EB300

Name: EcoFlow RIVER 3 Plus Smart Extra Battery (EB300)
Brand: EcoFlow
Price: 159 USD
Availability: InStock

286 Wh of LiFePO4, 7.7 lb, for the RIVER 3 Plus. $159 at EcoFlow, checked Oct 14, 2026: $0.56 for each watt-hour it adds.

Adds

286Wh

Price

$159

Per Wh added

$0.56

Each watt-hour it adds costs less than the RIVER 3 Plus's own ($0.91 on the RIVER 3 Plus), 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 3 Plus Extra Battery EB300 on each station
Station	Most per station	With one	With the most	Station and one battery
EcoFlow RIVER 3 Plus286 Wh on its own	–	572 Wh	–	$418

Specs

EcoFlow RIVER 3 Plus Extra Battery EB300: EcoFlow's figures
Capacity	286 Wh
Cells	LiFePO4
Weight	7.7 lb
Cable, in the maker's words	not named on the page

Where these figures come from

EcoFlow product page: "Choose either the EB300 (286Wh) or the EB600 (572Wh), and simply stack one at a time to achieve up to 858Wh of pure energy." · "Weighing just 7.7 lb, the EB300 is lighter than the RIVER 3 Plus." · "LiFePO4, 3000 cycles to 80% capacity"
On the RIVER 3 Plus: EcoFlow's page, "Choose either the EB300 (286Wh) or the EB600 (572Wh), and simply stack one at a time to achieve up to 858Wh of pure energy."
Price and stock: EcoFlow's US store, checked Oct 14, 2026.