Compatible with DELTA Pro Ultra and DELTA Pro Ultra X Inverters.
Expandable capacity – Increase the capacity of DELTA Pro Ultra or DELTA Pro Ultra X with an extra 6kWh.
*If you’ve purchased three or more battery packs, please contact our customer service team to claim your EcoFlow Fixing Metal Tab, which is necessary for securely stacking your battery packs.
Highlights:
–One-Month Backup: 6kWh for up to two-day backup, scalable to 90kWh for one-month coverage
–Space-Saving: Stack up the system in a neat, mess-free way
–One-Minute Setup: With a plug-and-play design
Specifications:
Dimensions: 26×18×8 in (including mat)

![DELTA Pro 3 Smart Extra Battery [Add-on]](https://astrynoms.shop/wp-content/uploads/2026/10/ecoflow-delta-pro-3-smart-extra-battery-58795204116823-scaled.png)



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