Product family ยท part of the Portable Power hub
Expansion batteries
Add-on batteries that enlarge a specific host power station, one page per officially named model. An expansion battery is not a general-purpose battery and not a power supply: most have no inverter and no outlets at all, and each one only works with the hosts its manufacturer names. Standalone storage you build your own system around is indexed separately as deep-cycle batteries, and the all-in-one units these attach to are battery power stations.
Anker SOLIX
Anker SOLIX BP3800 Expansion Battery
3,840 Wh LiFePO4 expansion battery for the Anker SOLIX F3800 (and F3800 Plus), 33 kg. Adds capacity to the host, with no outlets of its own and no direct charging. Up to six chain per host. 5-year warranty. Anker's own page conflicts on hosts, so the compatibility here is the rendered F3800 / F3800 Plus claim with the 'Only F3800' string preserved in notes.
BLUETTI
BLUETTI B300K Expansion Battery
2,764.8 Wh LiFePO4 expansion battery for BLUETTI's AC-series stations (AC200L, AC200MAX, AC300, AC500), 29.5 kg. Adds capacity to the host and carries a single 12 W USB-A as its only outlet, with no direct AC, solar or car charging of its own. How many chain depends on the host, from 2 up to 6.
EcoFlow
EcoFlow DELTA 2 Smart Extra Battery
1,024 Wh LiFePO4 add-on battery for the EcoFlow DELTA 2, 9.5 kg, the smallest and lightest unit in this family. Charges only through the host and has no outlets. Release status is unclear: the US product page is delisted, so specs come from EcoFlow's Canada and UK pages plus the official manual.
EcoFlow DELTA Pro Smart Extra Battery
3,600 Wh LiFePO4 add-on battery for the EcoFlow DELTA Pro, 38 kg, in the same wheeled trolley chassis as its host but with no outlets. Charges only through the host's extra-battery port. Up to two chain per DELTA Pro. 5-year warranty.
Goal Zero
Goal Zero Tank PRO 4000 Expansion Battery
3,994 Wh LiFePO4 expansion battery for the Goal Zero Yeti PRO 4000, 36.4 kg, the largest capacity in this family. Charges only through its host and has no user outlets. Up to four stack per Yeti PRO 4000, with a stated tipping-hazard warning. 5-year warranty.
Jackery
Jackery Battery Pack 2000 Plus
2,042.8 Wh add-on battery for the Jackery Explorer 2000 Plus, 19 kg, lithium-ion. Unlike most expansion units it has real DC charging inputs of its own (two DC 8mm ports, up to 24 A / 1400 W), but no user outlets. Up to 5 chain per host. Bound to the Explorer 2000 Plus only, and explicitly not compatible with the HomePower 2000 Plus v2.
How an expansion battery differs from a deep-cycle battery
Both are storage, and neither includes an inverter, but they are not interchangeable. A deep-cycle battery is generic: you choose a charge controller and an inverter and build whatever system you want around it, and its honest figures are its capacity, its charge and discharge envelope and its cycle life. An expansion battery is bound to a host: it plugs into one manufacturer's power station line, adds capacity to that station, and typically exposes no ports of its own, so the question that decides everything is which hosts the manufacturer actually names. That is why this family records compatibility verbatim and never infers it. A matching connector, a shared brand or a similar capacity are not compatibility claims, and pairing a unit with a host it was not built for can damage equipment.