EcoFlow Delta 3 Extra Lithium Battery Pack — 1024Wh Power Capacity

What extra runtime does it give you?

This expansion pack adds 1024Wh to a DELTA 3 Plus, doubling total capacity from 1024Wh to 2048Wh on the same 1800W output.

• A full-size fridge (~150W): runtime roughly doubles from ~6 hours to ~12 hours (+6 hours)
• A small camping fridge (~60W): from ~15 hours to ~29 hours (+14 hours)
• A 1200W kettle: from around 8 boils to around 17 boils (+9 boils)

Unlike some expansion batteries, this pack doesn't have its own standalone output — it's designed to dock onto the DELTA 3 Plus and be managed as one system through the EcoFlow app.

Figures are estimates based on typical appliance draw and around 15% inverter loss — actual runtime varies with the appliance, ambient temperature and load.

The EcoFlow Delta 3 Extra Battery is a matched expansion pack for the DELTA 3 Plus, adding another 1024Wh of runway when a single unit isn't enough to see you through an extended blackout or a multi-day trip off-grid. It docks straight onto the base station and is managed as one system through the EcoFlow app, so there's nothing extra to configure.

Built on the same long-life LFP cells as the main unit, it's designed to be stacked and carried alongside your Delta 3 Plus, with dual integrated handles making it easy to move even when full. It's a straightforward way to grow your power reserve without stepping up to a larger, heavier power station.

• Adds 1024Wh of extra capacity to the DELTA 3 Plus
• LFP battery chemistry rated for 4000 cycles to 80% capacity
• Plug-and-play docking via a dedicated extra-battery port
• Dual integrated handles for easy carrying and stacking
• Monitored and controlled through the EcoFlow app alongside the main unit
• Compact footprint at 398 x 200 x 198mm, 9.6kg
• Backed by a 5-year EcoFlow warranty