The EcoFlow DELTA Pro Ultra Smart Extra Battery expands your DELTA Pro Ultra system with an additional 6 kWh of long-lasting LFP storage. Designed for whole-home backup, off-grid living, and large solar installations, each battery adds up to two days of backup power, with system expansion up to 90 kWh for multi-week coverage.

With a plug-and-play stackable design, installation takes less than a minute—no wiring, no tools, and no wall mounting required. Its compact footprint and vertical stacking make it ideal for homes, cabins, garages, and utility spaces where reliability and organization matter.

Built with IP54 protection, ultra-durable LiFePO₄ cells (3500+ cycles), and wide operating temperatures with self-heating for winter performance, the DELTA Pro Ultra Smart Extra Battery delivers scalable, dependable energy storage for any whole-home or off-grid application.