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OUPES B2 Extra Battery 2,048 Wh of LiFePO4, 41.8 lb, for the Mega 1, Mega 2, Mega 2 Pro and Mega 3.
$600 at OUPES ($680 ), checked Oct 14, 2026 : $0.29 for each watt-hour it adds . With the 2 OUPES allows, the Mega 1 holds 5,120 Wh in all.
Each watt-hour it adds costs less than the stations' own ($0.68 on the Mega 1, $0.36 on the Mega 2, $0.34 on the Mega 2 Pro and $0.39 on the Mega 3 ), so it is the cheaper way to more stored energy than a second station, which adds outlets and output instead.
From OUPES's published figures and our own arithmetic; we have not tested it ourselves.
Which stations take it The most one station takes is OUPES's figure; a dash where its page gives none. Prices are both makers' prices added up, before cables.
OUPES B2 Extra Battery on each station Station Most per station With one With the most Station and one battery OUPES Mega 1 1,024 Wh on its own 2 3,072 Wh 5,120 Wh $1,299 OUPES Mega 2 2,048 Wh on its own 4 4,096 Wh 10,240 Wh $1,329 OUPES Mega 2 Pro 2,048 Wh on its own 4 4,096 Wh 10,240 Wh $1,299 OUPES Mega 3 3,072 Wh on its own 6 5,120 Wh 15,360 Wh $1,799
Specs OUPES B2 Extra Battery: OUPES's figures Capacity 2,048 Wh Cells LiFePO4 Weight 41.8 lb (18.9 kg) Cable, in the maker's words "Include Extra Battery Cable in the box"
Where these figures come from OUPES product page : "Basic Capacity** 2048Wh" · "41.8lbs (18.9kg)" · "Safe LiFePO4 Battery"On the Mega 1: OUPES's page , "Boost its power capacity fivefold to 5120Wh with two B2 battery packs." On the Mega 2: OUPES's page , "Build your ideal power setup with Mega 2’s expandable design—up to 10.24kWh with 4 B2 batteries." On the Mega 2 Pro: OUPES's page , "Up to 10.24kWh with 4 B2" On the Mega 3: OUPES's page , "Mega 3 scales with you! Expand up to 15.36kWh from 3.07kWh with 6 B2 extra batteries" Price and stock: OUPES's US store, checked Oct 14, 2026 . Next steps Your shortlist
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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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