The EcoFlow DELTA Pro 3 Extra Battery is a 4,096 Wh add-on pack, roughly 33 kg and 69.3 × 29.5 × 21.5 cm, designed to grow the storage of a DELTA Pro 3 Power Station in 4 kWh steps to a maximum of 12 kWh with two packs installed. The battery uses LiFePO4 chemistry rated for 4,000 cycles to 80% capacity, so it should last many years even in daily backup or storage cycling. A plug-and-play connector on the host station makes installation quick and the stackable form factor works well in a utility room, garage or workshop.

• 4,096 Wh LiFePO4 add-on capacity, matched to the DELTA Pro 3 electrical spec
• Stack up to two packs on a single DELTA Pro 3 for a total of 12 kWh of storage
• 4,000 cycles to 80% capacity for a long working life in home or professional use
• Plug-and-play connection, no separate charger or configuration step required
• Stackable form factor that mounts under or next to the DELTA Pro 3
• Charging and monitoring inherit every path available on the host station

Key specs

• Capacity: 4,096 Wh
• Cell chemistry: LiFePO4
• Cycles: 4,000 cycles to 80% capacity
• Weight: 33 kg
• Dimensions: 69.3 × 29.5 × 21.5 cm
• Warranty: 5 years
• Compatible with: EcoFlow DELTA Pro 3

The Extra Battery suits homeowners aiming for whole-day or multi-day backup, off-grid holiday properties, and professional set-ups where a real 12 kWh reservoir is needed and the extra weight can be planted permanently. Because it uses the same LiFePO4 chemistry and cycle rating as the host DELTA Pro 3, the whole system ages evenly and can be sized up over time as budgets or loads grow.