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BLUETTI · extra battery
BLUETTI B80 806 Wh of LiFePO4, 21.8 lb, for the AC50B and AC70.
$499 at BLUETTI ($699 ), sold out when checked Oct 14, 2026 : $0.62 for each watt-hour it adds .
Against the stations' own price per watt-hour ($0.89 on the AC50B and $0.47 on the AC70 ), it is the cheaper way to more stored energy on the AC50B. On the AC50B and AC70 it works in power bank mode: it recharges the station through an input rather than joining its battery.
From BLUETTI's published figures and our own arithmetic; we have not tested it ourselves.
Which stations take it The most one station takes is BLUETTI's figure; a dash where its page gives none. Prices are both makers' prices added up, before cables.
BLUETTI B80 on each station Station Most per station With one With the most Station and one battery BLUETTI AC50B 448 Wh on its own; in power bank mode it recharges the station – 1,254 Wh – $898 BLUETTI AC70 768 Wh on its own; in power bank mode it recharges the station – 1,574 Wh – $858
Specs BLUETTI B80: BLUETTI's figures Capacity 806 Wh Cells LiFePO4 Weight 21.8 lb (9.9 kg) Cable, in the maker's words "Additional cables required."
Where these figures come from BLUETTI product page : "BLUETTI B80/B80P Expansion Battery | 806Wh" · "About 9.9kg / 21.83lbs" · "LiFePO4 (Lithium Iron Phosphate)"On the AC50B: BLUETTI's page , "Currently, the AC50B supports capacity expansion with B80 battery in Power Bank Mode." On the AC70: BLUETTI's page , "AC70 supports capacity expansion with B80 / B230 / B300 expansion batteries in Power Bank Mode." Price and stock: BLUETTI's US store, sold out when 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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