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EcoFlow · extra battery
EcoFlow DELTA 3 Max Plus Smart Extra Battery 2,048 Wh of LiFePO4, for the DELTA 3 Max Plus and DELTA 3 Ultra Plus.
$859 at EcoFlow, checked Oct 14, 2026 : $0.42 for each watt-hour it adds . With the 2 EcoFlow allows, the DELTA 3 Max Plus holds 6,144 Wh in all.
Each watt-hour it adds costs less than the stations' own ($0.56 on the DELTA 3 Max Plus and $0.52 on the DELTA 3 Ultra 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 DELTA 3 Max Plus Smart Extra Battery on each station Station Most per station With one With the most Station and one battery EcoFlow DELTA 3 Max Plus 2,048 Wh on its own 2 4,096 Wh 6,144 Wh $2,008 EcoFlow DELTA 3 Ultra Plus 3,072 Wh on its own 2 5,120 Wh 7,168 Wh $2,458
Specs EcoFlow DELTA 3 Max Plus Smart Extra Battery: EcoFlow's figures Capacity 2,048 Wh Cells LiFePO4 Weight 16 kg (35.3 lb) Cable, in the maker's words "Requires the EcoFlow Smart Extra Battery Expansion Adapter to connect two Smart Extra Batteries to the DELTA 3 Max Plus (2048Wh) or DELTA 3 Ultra Plus (3072Wh)."
Where these figures come from EcoFlow product page : "Increase the capacity of DELTA 3 Max Plus (2048Wh) or DELTA 3 Ultra Plus (3072Wh) with an extra 2048Wh." · "16kg±0.4kg" · "LFP(LiFePO4)"On the DELTA 3 Max Plus: EcoFlow's page , "DELTA 3 Max Plus (2048Wh) has one Extra Battery Port. You can connect a maximum of two extra batteries via EcoFlow Smart Extra Battery Expansion Adapter." On the DELTA 3 Ultra Plus: EcoFlow's page , "Add up to two DELTA 3 Max Plus (2048Wh) Smart Extra Batteries to gain a capacity of 6144Wh for DELTA 3 Max Plus (2048Wh) and 7168Wh for DELTA 3 Ultra Plus (3072Wh)," Price and stock: EcoFlow's US store, checked Oct 14, 2026 . Next steps Your shortlist
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Aferiy P280 Aferiy P300 Aferiy P310 Allpowers R1500 Allpowers R3500 Allpowers R4000 Allpowers S2000 Pro Anker SOLIX C1000 Anker SOLIX C1000 Gen 2 Anker SOLIX C200 DC Anker SOLIX C2000 Gen 2 Anker SOLIX C300 Anker SOLIX C300 DC Anker SOLIX C300X Anker SOLIX F2600 Anker SOLIX F3000 Anker SOLIX F3800 Anker SOLIX F3800 Plus BLUETTI AC180 BLUETTI AC180P BLUETTI AC200L BLUETTI AC50B BLUETTI AC70 BLUETTI Apex 300 BLUETTI Elite 100 mini BLUETTI Elite 100 V2 BLUETTI Elite 200 V2 BLUETTI Elite 30 V2 BLUETTI Elite 300 BLUETTI Elite 400 Dabbsson 1000L Dabbsson 2000L Dabbsson 3000L Dabbsson 300E Dabbsson 600L Dabbsson DBS1000 Pro Dabbsson DBS1300 Dabbsson DBS2100 Pro Dabbsson DBS2300 Plus DJI Power 1000 DJI Power 2000 DJI Power 500 EcoFlow DELTA 2 Max EcoFlow DELTA 3 EcoFlow DELTA 3 Classic EcoFlow DELTA 3 Max EcoFlow DELTA 3 Max Plus EcoFlow DELTA 3 Plus EcoFlow DELTA 3 Ultra EcoFlow DELTA 3 Ultra Plus EcoFlow DELTA Pro EcoFlow DELTA Pro 3 EcoFlow DELTA Pro Ultra EcoFlow RIVER 2 (240) EcoFlow 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Differences only Same AC load (W)
Runtime is rated capacity × 0.85 ÷ watts. Check startup draw and connections separately. Prices are the maker's, with the day they were checked. Open this comparison as a page you can share
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