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EcoFlowExpansion batteryLiFePO4

DELTA 3 Series Smart Extra Battery

Name: DELTA 3 Series Smart Extra Battery
Brand: EcoFlow
Price: 369.00 USD
Availability: InStock

Expansion battery that increases DELTA 3 Plus/DELTA 3 capacity by 1024Wh with LFP chemistry and 3000+ cycle life.

Capacity

1,024 Wh

Cycle life

3,000

Warranty

5 yr

Best price

Updated 3h ago

$369$599

−$230 (38%)

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Price history · 90 days

EcoFlow Direct

$369

90-day low

$369 (2026-06-08)

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Runtime predictions for your loads

Based on 1,024 Wh capacity · 95% LiFePO4 DoD · 90% AC inverter efficiency. Phase-1 uses constant-load math; time-resolved multi-day SOC simulation is the Phase-2 north star.

Load profile	Continuous draw	Runtime estimate	% of 48hr target
CPAP only (overnight)	60W	14.6 hr	30%
Fridge only (cycle-averaged)	70W	12.5 hr	26%
Wifi router + LED lights	55W	15.9 hr	33%
Your full continuous load (215W)	215W	4.1 hr	8%
Microwave + base load (peak)	1300W	40 min	1%
Window AC 8,000 BTU (avg)	700W	1.3 hr	3%

How DELTA 3 Series Smart Extra Battery compares to alternatives

DELTA 3 Series Smart Extra Battery specs verified from automated extraction with cross-source verification. Alternatives marked “pending verify” haven't been through the verification pipeline yet.

Capacity

DELTA 3 Series Smart Extra Battery1,024 Wh

EcoFlow DELTA 2 Max Smart Extra Batterypending verify