Wattstanding
EcoFlow DELTA Pro 3 Smart Extra Battery

Product image: EcoFlow

Expansion battery · EcoFlow

EcoFlow DELTA Pro 3 Smart Extra Battery

EcoFlow · 4,096 Wh add-on

The short answer

The EcoFlow DELTA Pro 3 Smart Extra Battery adds 4,096 Wh of storage. EcoFlow lists it at $1,814, about $443 per kWh.

Capacity
4,096 Wh
Weight
72.8 lb
Price seen
$1,814

Good fit if

  • You already own the compatible base unit and need longer runtime
  • You prefer adding storage to adding a second station

Look elsewhere if

  • You do not own the compatible base unit
  • You need more output watts — an expansion battery adds energy, not power
$1,814EcoFlow listed price (base model) · seen 30 Sep 2026
View at EcoFlow

Every link opens the product page for this exact model. We may earn a commission; it never changes what we publish. Disclosure

What it adds

An expansion battery adds watt-hours to a compatible power station without adding output: the base unit's inverter still limits how many watts you can run, but you can run them for longer.

Practical noteWe could not match this battery to a station in our catalog from the listing text. Check the seller's compatibility list before buying.

Fit check before you buy

An expansion battery only works with the units its maker lists.

✓ Required? Check firsti Good to know
  • ✓Compatible base unitConfirm the exact base model and version with the seller.
  • ?Connection cableSome expansion batteries need a specific cable or adapter that may be sold separately.
  • iWeight72.8 lb as stated.

Specifications

Each figure is labelled with where it comes from. Numbered references link to the source list below.

Manufacturer storeRetailer listingWattstanding calculationNot verified

Published specifications

Battery capacity4,096 Wh[S1]Manufacturer store
Weight72.8 lb[S1]Manufacturer store
Warranty5. EcoFlow Extra Battery Cable[S1]Manufacturer store

Wattstanding calculations

Price per kWh$443Wattstanding calculation

Limitations to weigh

  • Specifications are the maker's or seller's; Wattstanding has not tested this product.
  • Compatibility is the seller's statement; confirm it for your exact base unit and version.
  • Prices change; confirm the price and what is included.

Alternatives worth comparing

Anker SOLIX BP3800 Expansion Battery (A1790111-85)3,840 Wh; $14 less
FOSSiBOT FB3840 Expansion Battery - 3840Wh LFP (For FOSSiBOT F3600 Pro) (EUFB3840)3,840 Wh; $315 less
BLUETTI B500K for AC300/AC200L5,120 Wh; $15 less
Jackery Battery Pack 3600 Plus3,584 Wh; $465 less

Where to buy

Our link opens this exact product page. Prices and stock change; check before you order.

$1,814EcoFlow listed price (base model) · seen 30 Sep 2026
View at EcoFlow

Every link opens the product page for this exact model. We may earn a commission; it never changes what we publish. Disclosure

Questions buyers ask

Will the EcoFlow DELTA Pro 3 Smart Extra Battery work with my power station?
Check the seller's compatibility list for your exact base model.
Where can I buy the EcoFlow DELTA Pro 3 Smart Extra Battery?
1 seller list it: EcoFlow.

Sources and verification

  1. EcoFlow — EcoFlow DELTA Pro 3 Smart Extra Battery — product page and specifications Retrieved 30 Sep 2026

Wattstanding has not tested this product hands-on. This reference is compiled from the sources above; our calculations are labelled and show their working. Electrical work belongs to a licensed electrician. Last verified 30 Sep 2026. How we work