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Ecoflow DELTA 3 Max Plus Extra Battery

Ecoflow

$799.00
$899.00 $799.00
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Product Details

The DELTA 3 Max Plus Extra Battery doubles the DELTA 3 Max's capacity from 2048Wh to 4096Wh — providing genuine multi-day off-grid capability or 24+ hours of whole-home essential backup from a single portable system. Built on the same 4,000-cycle LFP chemistry as the DELTA 3 Max itself, it adds a decade of service life to the combined system.

Brand new in box

Brand new in box

5 year factory warranty

5 year factory warranty

Fast shipping (5–7 business days)

Fast shipping (5–7 business days)

Authorized EcoFlow dealer

Authorized EcoFlow dealer
  • Doubles DELTA 3 Max from 2048Wh to 4096Wh — multi-day off-grid or 24h home backup
  • 4,000-cycle LFP chemistry — matched to DELTA 3 Max's battery specification and longevity
  • Direct expansion port connection — no additional hardware required
  • Charges simultaneously with host station via AC, solar, or DC input
  • EcoFlow BMS manages automatic charge balancing between host and extra battery

  • Compatibility - Works seamlessly with EcoFlow DELTA 3 Max Plus, EcoFlow DELTA 3 Ultra Plus.
  • Long-Lasting LFP Battery
  • Easy to Use - Plug-and-play design for straightforward operation.
  • Stackable Design - Perfect for home or indoor power backup applications.

This item comes with a 5-Year Factory Warranty from EcoFlow. A 3-Year Standard Warranty is included automatically from the date of original purchase, covering defects in materials, workmanship, and performance under normal use. An additional 2-Year Extended Warranty is available at no extra charge — activate it by downloading the EcoFlow App, logging into your EcoFlow account, and registering your product using the unit serial number within the standard warranty period. This gives you up to 5 years of total factory warranty coverage. Exclusions apply for damage caused by misuse, unauthorized modification, disassembly, exposure to excessive heat or liquids, or use of non-EcoFlow-approved accessories. For warranty claims: support@ecoflow.com or 1-800-368-8604.