powerstations.reviews

As an Amazon Associate I earn from qualifying purchases. Affiliate disclosure.

EcoFlow · extra battery

EcoFlow RIVER 3 Plus Extra Battery EB600

572 Wh of LiFePO4, 12.8 lb, for the RIVER 3 Plus. $249 at EcoFlow, sold out when checked Oct 14, 2026: $0.44 for each watt-hour it adds.

Adds

572Wh

Price

$249

Per Wh added

$0.44

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.

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 EB600 on each station
StationMost per stationWith oneWith the mostStation and one battery
EcoFlow RIVER 3 Plus286 Wh on its own – 858 Wh – $508

Specs

EcoFlow RIVER 3 Plus Extra Battery EB600: EcoFlow's figures
Capacity572 Wh
CellsLiFePO4
Weight12.8 lb
Cable, in the maker's wordsnot named on the page
Where these figures come from

Your shortlist

Compare power stations

Runtime is rated capacity × 0.85 ÷ watts. Check startup draw and connections separately. Prices are the maker's, with the day they were checked.