2048Wh of Expandable LFP Storage for Your DELTA 3 Max Plus or Ultra Plus — Plug In and Scale Up The EcoFlow DELTA 3 Max Plus (2048Wh) Smart Extra Battery is purpose-built to expand the energy storage capacity of the DELTA 3 Max Plus and DELTA 3 Ultra Plus Portable Power Stations. Built with automotive-grade full-tab LFP cells, it delivers an additional 2048Wh of clean, long-lasting capacity through a straightforward plug-and-play connection — no setup, no configuration. Add one extra battery to scale to 4kWh with the DELTA 3 Max Plus, or 5kWh with the DELTA 3 Ultra Plus. Add two batteries (via the Smart Extra Battery Expansion Adapter) to reach up to 6.1kWh or 7.2kWh respectively. The EcoFlow App lets you monitor charge level, working status, and temperature in real time. ⚠ Compatibility Notice. This Smart Extra Battery is compatible with the EcoFlow DELTA 3 Max Plus and DELTA 3 Ultra Plus only. Future firmware updates are required for compatibility with the DELTA 3 and DELTA 3 Plus. ⚠ Cannot be used standalone. This extra battery requires connection to a compatible DELTA 3 Max Plus or DELTA 3 Ultra Plus power station to operate. It cannot function as a standalone unit. ⚠ Sold Separately — Expansion Adapter. Connecting two Smart Extra Batteries simultaneously requires the EcoFlow Smart Extra Battery Expansion Adapter, which is a separate accessory. US availability expected approximately January 2026. Choose Your Option Option What You Get Total Capacity DELTA 3 Max Plus (2048Wh) Smart Extra Battery Extra battery only — pairs with your existing DELTA 3 Max Plus or DELTA 3 Ultra Plus +2048Wh added to your station DELTA 3 Max Plus (2048Wh) + DELTA 3 Max Plus Smart Extra Battery Run your appliances with industry-leading output. Compatible with the DELTA 3 Max Plus Smart Extra Battery (2kWh) — scale up to 4kWh, extending backup time and increasing appliance runtime. 4kWh combined DELTA 3 Ultra Plus (3072Wh) + DELTA 3 Max Plus Smart Extra Battery Compatible with the DELTA 3 Max Plus Smart Extra Battery (2kWh) — scale up to 5kWh, extending backup time and increasing appliance runtime. 5kWh combined Adds 2048Wh of LFP capacity — scales DELTA 3 Max Plus to 4kWh and DELTA 3 Ultra Plus to 5kWh with a single battery Up to 3x runtime expansion — connect two batteries (via Expansion Adapter) to reach 6.1kWh or 7.2kWh total Automotive-grade full-tab LFP cells — reduced resistance, higher efficiency, lower heat, and extended battery lifespan Approximately 25% more compact than DELTA 2 Max Smart Extra Battery — easier to store, carry, and stack Plug-and-play with zero setup — simply connect to the power station Extra Battery Port and it is ready EcoFlow App monitoring — track charge level, working status, and temperature from your phone 5-year warranty — 3-year standard + 2-year extended upon EcoFlow App registration Specification Detail Rated Capacity 2048Wh (51.2V 40Ah) Cell Chemistry LFP (LiFePO4) Output Port 43.2-57.6V, 100A Input Port 43.2-57.6V, 48A Net Weight 16 kg ± 0.4 kg Dimensions (H x W x D) 494 x 239 x 196 mm Charge Temperature 32 to 113 deg F (0 to 45 deg C) Discharge Temperature 14 to 113 deg F (-10 to 45 deg C) Storage Temperature 14 to 113 deg F (-10 to 45 deg C) Compatible With DELTA 3 Max Plus, DELTA 3 Ultra Plus (DELTA 3 / DELTA 3 Plus via future firmware) App Control EcoFlow App (charge level, status, temperature) Warranty 5 Years
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