Expand your power station’s capacity – quickly, safely, and seamlessly.
The EcoFlow DELTA 3 Smart Extra Battery gives you the perfect way to scale your energy storage. It adds 1 024 Wh of capacity and is designed to stack with the DELTA 3 (or compatible EcoFlow models) via plug-and-play simplicity.
With advanced LFP battery chemistry delivering 4 000+ full cycles (approx. 10 years of daily use), you’ll have reliable energy for home backup, RVs, off-grid adventures, and more.
Capacity Expansion: Add 1 024 Wh to your DELTA 3 system — double your runtime without replacing the base unit.
Long-Life LFP Battery: Built to last — upwards of 4 000 cycles until 80% capacity.
Compact & Easy to Use: 1/3 smaller than the previous generation Extra Battery, stackable design, no complicated setup required.
Smart Monitoring & Control: Use the EcoFlow app to check battery status, remaining time, input/output power, and more remotely.
Versatile Recharge Options: Recharge via the main unit’s Extra Battery port using AC, solar panels, or the smart generator.
Home backup during power outages
RVs, motorhomes or mobile/off-grid living
Outdoor adventures and camping
Users who want expandable, long-life energy storage
When you already own an EcoFlow DELTA 3 system, adding the Smart Extra Battery means you don’t have to buy another full power station. You get more runtime, smarter monitoring, and a solution built to last — all in a sleek, stackable form factor.
Capacity: 1,024 Wh (51.2 V)
Battery Type: LiFePO₄ (LFP)
Cycle Life: 4,000+ cycles to 80% capacity
Dimensions: Approx. 397.6 × 202 × 198 mm
Weight: Approx. 9.6 kg
Compatibility: Built for EcoFlow DELTA 3 / DELTA 3 Plus; also works with select earlier models when used with an adapter (please verify compatibility before purchase).
1 × EcoFlow DELTA 3 Smart Extra Battery
1 × Extra Battery Connection Cable
1 × User Manual