Expansion battery entity · 3.6 kWh LiFePO4 expansion · Current

EcoFlow DELTA Pro Smart Extra Battery

Name: EcoFlow DELTA Pro Smart Extra Battery
Brand: EcoFlow

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.

brand: EcoFlow family: DELTA Pro capacity: 3600 Wh confidence: high updated: Aug 15, 2026

This battery only works with the hosts named below. An expansion battery only enlarges a specific host power station. It is not a general-purpose battery and, on its own, usually has no inverter and no outlets at all. Compatibility below is recorded verbatim from the manufacturer and is never inferred from a matching connector, a shared brand or a similar capacity: pairing one with a host it was not built for can damage equipment. Capacity shown is this unit's own, never a combined station-plus-expansion system total.

EcoFlow DELTA Pro Smart Extra Battery shown upright and head-on against white: a tall dark trolley-style case with a silver top shell and moulded top grip, small wheels and a fold-down pull handle at the base, and a front LCD reading charge percentage with input and output watt readouts above a single round ON/OFF button. The lower front face carries no output outlets. No host station is shown. — Manufacturer product image, from EcoFlow. Shown for identification only; specifications come from the sources listed below.

Machine summary · expansion_battery · ecoflow-delta-pro-smart-extra-battery

brand: EcoFlow
model_name: DELTA Pro Smart Extra Battery
release_status: current
chemistry: lifepo4
capacity_wh: 3600
compatible_host_models: EcoFlow DELTA Pro
has_own_outlets: false
weight_kg: 38
confidence_level: high
source_last_checked: 2026-08-15
json_export: /expansion-batteries/ecoflow-delta-pro-smart-extra-battery.json

Overview

The EcoFlow DELTA Pro Smart Extra Battery is a 3,600 Wh LiFePO4 add-on that doubles the storage of an EcoFlow DELTA Pro. It uses the same wheeled trolley chassis as the host at 38 kg, but it is battery-only: it has no output outlets and charges through the host's extra-battery port, with no AC or solar input of its own. Up to two extra batteries connect to one DELTA Pro. EcoFlow states the DELTA Pro is compatible with the DELTA Pro Smart Extra Battery, and the unit can also sit alongside the EcoFlow Smart Generator as a companion device rather than a host. EcoFlow does not publish an amp-hour figure for its extra batteries, so capacityAh is null; the nominal voltage is 48 V. EcoFlow quotes cycle life as capacity retention (3,500 cycles to 80 percent and 6,500 to 50 percent) rather than a depth-of-discharge basis, so no DoD-qualified cycle count is stored. Warranty is 5 years.

Variant note: DELTA Pro Smart Extra Battery (DELTAProEB-US) for the original DELTA Pro. Not to be confused with the DELTA Pro 3 or DELTA Pro Ultra battery modules, which are different host lines.

Data note: Values traced to the EcoFlow DELTA Pro Smart Extra Battery product page and its user manual PDF (2026-08-15), SKU DELTAProEB-US. capacityWh is this unit's own 3,600 Wh; EcoFlow publishes no amp-hour figure for its extra batteries, so capacityAh is null and the Ah x V consistency check does not apply. cycleLifeCycles is null by policy: EcoFlow's 3,500 / 6,500 cycle figures are capacity-retention (to 80% and 50%), not a depth-of-discharge basis. hasOwnOutlets is false: the unit is battery-only and charges through the host's extra-battery port. It can also be used alongside the EcoFlow Smart Generator as a companion device, which is not a host and is not recorded as compatibility.

Specifications

Host compatibility leads this table because it is what makes an expansion battery meaningful, and it is recorded verbatim from the manufacturer and never inferred. The capacity shown is this unit's own rated energy, not a combined host-plus-expansion system total. Any cycle-life figure carries the depth of discharge it is quoted at, and figures the manufacturer does not publish are left blank rather than estimated. Exact claims and links are in the provenance table.

Host compatibility
Attribute	Value
Official compatibility statement	DELTA Pro is compatible with the DELTA Pro Smart Extra Battery
Host models named by the manufacturer	EcoFlow DELTA Pro
Expansion units the host supports	Up to 2

Capacity (this unit only)
Attribute	Value
Rated energy	3,600 Wh
Nominal voltage	48 V
Chemistry	LiFePO4 (lithium iron phosphate)

Integration
Attribute	Value
Outlets on the expansion unit itself	None. It adds capacity to the host and has no output ports of its own
Direct charging inputs	None direct: charges through the host DELTA Pro's extra-battery port. It has no AC or solar input of its own.

Cycle life
Attribute	Value
Rated cycle life	No cycle-life figure published
Cycle-life test conditions	EcoFlow states 3,500 cycles to 80% capacity and 6,500 cycles to 50% capacity. These are capacity-retention figures, not a depth-of-discharge basis, so no DoD-qualified cycle count is stored.

Temperature
Attribute	Value
Charge temperature range	0 °C to 45 °C (32 °F to 113 °F)
Discharge temperature range	-10 °C to 45 °C (14 °F to 113 °F)
Storage temperature range	-10 °C to 45 °C (14 °F to 113 °F)

Physical
Attribute	Value
Weight	38 kg (83.8 lb)
Dimensions (L × W × H)	635 × 285 × 416 mm

Model & availability
Attribute	Value
Warranty	5 years
Release status	Current
Market region	US

Use cases

Doubling an EcoFlow DELTA Pro's storage for whole-day or multi-day backup
DELTA Pro systems paired with the EcoFlow Smart Generator for extended off-grid runtime

Strengths and weaknesses

Strengths

Large 3,600 Wh LiFePO4 capacity in the same rollable trolley chassis as the host
Wheels and a pull handle make a 38 kg unit movable by one person
5-year warranty
Chemistry, capacity, weight and dimensions all published with a manual PDF

Weaknesses

No outlets and no direct charging: it works only through a DELTA Pro
EcoFlow publishes no amp-hour figure, so capacityAh cannot be recorded
Bound to the DELTA Pro host line
Cycle life is quoted only as capacity retention, not a depth-of-discharge basis

Where to buy

Retail offers — a commerce layer, not a source for any specification on this page. No current price is tracked for this product; check the merchant for pricing.
Merchant	Price	Checked	Availability	Link
EcoFlowprimaryManufacturer direct	Not tracked	—	—	View at EcoFlow

Sources and provenance

Core specifications come from official manufacturer sources only, with the exact claim text preserved per field. Spec sheets and manuals outrank marketing copy. See the methodology for the full policy.

Field-level provenance (9 entries, checked 2026-08-15)
Field	Normalized value	Raw claim	Source	Confidence
`chemistry`	lifepo4	LiFePO4	Official product page	high
`capacityWh`	3600	3600Wh	Official product page — This unit's own energy. NOT a combined-system total.	high
`nominalVoltageV`	48	48V	Official manual (PDF) — EcoFlow publishes no amp-hour rating for its extra batteries, so capacityAh is null.	high
`weightKg`	38	—	Official manual (PDF) — Published weight 38 kg; sourced via research handoff (2026-08-15).	high
`dimensionsMm`	[635,285,416]	—	Official manual (PDF) — 635 x 285 x 416 mm; sourced via research handoff (2026-08-15).	high
`officialCompatibilityStatement`	DELTA Pro is compatible with the DELTA Pro Smart Extra Battery	DELTA Pro is compatible with the DELTA Pro Smart Extra Battery	Official product page — Single host. May also pair with the EcoFlow Smart Generator as a companion device (not a host).	high
`compatibleHostModels`	["EcoFlow DELTA Pro"]	DELTA Pro	Official product page — Up to two extra batteries per DELTA Pro.	high
`warrantyYears`	5	—	Official product page — 5-year warranty; sourced via research handoff (2026-08-15).	high
`chargeTempRangeC`	[0,45]	—	Official manual (PDF) — Charge 0 to 45 C, discharge -10 to 45 C, storage -10 to 45 C; sourced via research handoff (2026-08-15).	high

All sources used

entity: expansion_battery/ecoflow-delta-pro-smart-extra-battery source_last_checked: 2026-08-15 confidence_level: high methodology: /methodology/