EcoFlow · Batteries

EcoFlow DELTA Pro Ultra Extra Battery (6144 Wh)

$1,509.49

Works with

DELTA Pro Ultra, DELTA Pro Ultra Inverter, and Ultra X

Required for the DELTA Pro Ultra Inverter, which ships without a battery. On a complete DELTA Pro Ultra it adds another 6,144 Wh, up to 30,720 Wh across five batteries. LiFePO4 cells hold 80% capacity after 3,500 cycles. Plug-and-play stacking with no tools, IP54 dust/splash rating, and a connection cable included.

In stock

24-Month 326energy Limited Seller Warranty · see Limited Warranty

Quantity

Selection · 1 item$1,509.49

Free Standard Shipping — Estimated delivery: up to 7 business days. 30-day returns on eligible unused and uninstalled products.

Use

What it adds

The EcoFlow DELTA Pro Ultra Extra Battery is the core 6,144 Wh energy storage module for the DELTA Pro Ultra whole-home backup platform. It is required to operate the standalone DELTA Pro Ultra Inverter (which is sold without an internal battery) and stacks up to five modules per inverter for 30,720 Wh of capacity.

Engineered with automotive-grade LiFePO4 cells, an IP54 dust- and splash-resistant enclosure, and internal self-heating films for cold-weather operation down to -20°C (-4°F), each battery locks onto the stack and connects in under a minute with the included short high-current interlock cable.

Compatibility

Product details

Brand: EcoFlow
Category: Batteries
Compatible with: DELTA Pro Ultra, DELTA Pro Ultra Inverter, and Ultra X
Weight: 111.8 lb / 50.7 kg
Dimensions: 26.0 × 18.0 × 8.0 in (660 × 455 × 204 mm)
Model: EFYJ751-BP
Capacity: 6,144 Wh (102.4V⎓60Ah)
Cell chemistry: LiFePO4 (LFP)
Cycle life: 3,500 cycles to 80%+ capacity
Ingress protection: IP54
Operating temperature: -20°C to 45°C (-4°F to 113°F)
Altitude: < 3,000 m

In action

Reference setups & real-world use

EcoFlow DELTA Pro Ultra Extra Battery (6144 Wh) — Whole-Home Garage & Smart Home Panel 2 Tower — Whole-Home Garage & Smart Home Panel 2 Tower
Two 6,144 Wh EcoFlow DELTA Pro Ultra Extra Batteries (EFYJ751-BP) locked directly beneath the DELTA Pro Ultra Inverter on the wheeled trolley base for 120V/240V whole-home circuit backup.

EcoFlow DELTA Pro Ultra Extra Battery (6144 Wh) — Side Battery Port & 0.2 m High-Current Interlock Cable — Side Battery Port & 0.2 m High-Current Interlock Cable
Each IP54-rated 6,144 Wh LFP battery module links to the DELTA Pro Ultra Inverter above it in under a minute using the included 0.2 m Battery Connection Cable.

Highlights

Why it's worth it

Required for the DELTA Pro Ultra Inverter, which is sold without a battery
6,144 Wh per module — stack up to five batteries for 30,720 Wh of whole-home backup
LFP (LiFePO4) cells rated for 3,500+ cycles to 80% capacity, with overvoltage, overload, overtemperature, short-circuit, low-voltage and low-temperature protection
IP54 dust/splash rating with built-in heaters for reliable operation down to -20°C (-4°F)
Plug-and-play stacking in under a minute — no tools, no loose cables
Pairs with EcoFlow Smart Home Panel 2 / 3 and Smart Gateway for automated whole-home backup

In the box