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Review · Power station extra batteriesResearched

EcoFlow DELTA 3 Max Plus Extra Battery review

EcoFlow DELTA 3 Max Plus Smart Extra Battery (2,048Wh)

By Tom Calder

Key specs

The maker's figures.

Capacity
2,048 Wh
Fits
EcoFlow DELTA 3 Max Plus, DELTA 3 Ultra Plus
Weight
35.3 lb
Cycles
—
Battery
LiFePO4
Our verdict · Researched
3.9 / 5

2,048Wh for the DELTA 3 Max Plus and DELTA 3 Ultra Plus; a second one on a Max Plus needs EcoFlow's expansion adapter, which EcoFlow says will be released soon. EcoFlow says DELTA 3 and DELTA 3 Plus support needs a later firmware release.

Best for
Adding 2kWh to a DELTA 3 Max Plus
Skip it if
You own a DELTA 3 or DELTA 3 Plus and can't wait for the firmware
Current price
$859.00
Last checked November 14, 2026
In stock
Check price at EcoFlow →

We earn a commission if you buy through the retailer links on this page. It doesn't change our verdict. How we make money →

Researched, not used. We haven't used this product. This review is built from the maker's specifications, owner reports and our own sizing.

What we like

  • 4,096 Wh as sold
  • 3,000 W, 6,000 W surge
  • Expands to 10 kWh (with DELTA Pro 3 extra batteries)
  • 2,048Wh at 35.3 lb

Worth knowing

  • 120V only
  • 1,000 W solar input
  • A second battery on a Max Plus needs an adapter EcoFlow hasn't released
  • EcoFlow publishes no cycle figure

ⓘ As an Amazon Associate, PreparedStates earns from qualifying purchases. We may earn a commission when you buy through our links. When two products are close, commission can decide which one we pick. A clearly better product always wins. Amazon prices come from Amazon's own product data and can change at any time.

Who shouldn't buy this

Don't buy it if you own a DELTA 3 or DELTA 3 Plus and can't wait for the firmware: the DELTA 3 Series battery fits now.

How this review works

This is a Researched review: we haven't used this product. We check every specification against at least two independent sources, re-check the US price on a schedule where we can track it automatically, and say plainly who it isn't for. Commissions never change a rating.

How we review →Full methodology →

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