EcoFlow DELTA Pro 3 Smart Extra Battery

Name: EcoFlow DELTA Pro 3 Smart Extra Battery
Brand: EcoFlow

Ranked #2 of 9 in Best Expansion Batteries for Power Stations: EcoFlow, Jackery, Anker, BLUETTI (2026). Here is every spec we scored, where it came from, and how it compares.

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EcoFlow DELTA Pro 3 Smart Extra Battery

Best for: 4 kWh more for the DELTA Pro 3

7.5/10

What we like

Doubles a DELTA Pro 3
Good energy per kg

Watch out for

DELTA Pro 3 only
EcoFlow lists it as not being restocked
No cycle rating on the pack page

Score breakdown

Capacity 56%

Energy per kg 44%

Capacity	4096 Wh
Energy per kg	124.1 Wh/kg
Cycle rating	Not listed
Capacity	4,096 Wh
Fits	DELTA Pro 3 (up to 12 kWh total)
Weight	33 kg
Dimensions	694 × 295 × 215 mm
Note	EcoFlow says this pack will not be restocked
Price	Check price