Category
Expansion Batteries
US-market add-on expansion batteries indexed from official manufacturer sources only. Each one enlarges a specific host power station, so host compatibility is the defining field and is recorded verbatim from the manufacturer, never inferred from a connector, a shared brand or a similar capacity. Capacity is always this unit's own rated energy, never a combined station-plus-expansion system total.
Category overview
This category covers add-on batteries that increase the capacity of a specific host power station, one entity per officially named model. It is deliberately separate from deep-cycle batteries. A deep-cycle battery is generic storage: the buyer supplies a charge controller and an inverter and builds a system 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 line: it plugs into one manufacturer's power station, adds capacity to that station, and usually has no inverter and no output ports of its own, so the question that decides whether it is any use at all is which hosts the manufacturer names. That is why the schema makes the official compatibility statement a required field and records it verbatim. A matching connector, a shared brand or a similar capacity are never treated as a compatibility claim, because attaching an expansion battery to a host it was not built for can damage equipment, and this is the safety-critical rule of the family the way the outdoor-only carbon-monoxide gate is for generators. Two further anti-hype rules are enforced. Capacity is always this unit's own rated energy in watt-hours, never the combined system total the marketing leads with, because a headline like 'up to 25 kWh' describes a host plus several expansions rather than the component on the page. And an expansion battery is not a power supply: a claim that it has its own outlets must name the ports, since most have none. Expansion batteries sit beside battery power stations, deep-cycle batteries, solar panels, RV solar kits and generators as the capacity layer of a system a buyer has usually already chosen.
Products in this category
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 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 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 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 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.
Comparisons in this category
Structured attributes in this category
Every product in Expansion Batteries is indexed against these normalized attributes. Comparison matrices use the same keys, so values are directly comparable across brands.
| Key | Attribute | Unit | Description |
|---|---|---|---|
official_compatibility_statement | Official compatibility statement | — | Verbatim manufacturer statement of which host power stations this battery works with. Never inferred. The defining and safety-critical field of this family. |
compatible_host_models | Compatible host models | — | The exact host model names the manufacturer names, as they name them. |
capacity_wh | Rated energy | Wh | This expansion unit's own rated energy, never a combined host-plus-expansion system total. |
chemistry | Chemistry | — | lifepo4, lithium_ion_other, agm, gel, or flooded_lead_acid. |
max_chainable | Expansion units supported | — | How many expansion units the host officially supports, where stated. |
has_own_outlets | Own outlets | — | Whether the expansion unit itself exposes any AC, DC or USB ports. Most do not; a true value names the ports. |
charging_inputs | Direct charging inputs | — | Whether the unit can be charged directly by AC or solar, and at what rating, where stated. |
cycle_life | Cycle life | — | Rated cycles, recorded only with the depth of discharge it is quoted at. |
temperature_ranges | Temperature limits | — | Charge, discharge and storage temperature ranges where published. |
weight_kg | Weight | kg | — |
warranty_years | Warranty | years | — |
Quick facts
- Entity type: category
- Indexed products: 6
- Indexed comparisons: 0
- Normalized attributes: 11
- Last updated: Aug 15, 2026
- Canonical URL:
/categories/expansion-batteries/ - JSON export: /categories/expansion-batteries.json