EcoFlow · Batteries

EcoFlow DELTA 2 Max Smart Extra Battery (2048 Wh)

$529.99

Works with

DELTA 2 / DELTA Max / DELTA 2 Max (up to 2)

Adds 2,048 Wh of 3,000-cycle LiFePO4 storage per module — stack up to two units on DELTA 2 Max for 6,144 Wh total, or pair with DELTA 2 / DELTA Max. Includes front LCD status screen and XT150 expansion cable.

In stock

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

Quantity

Selection · 1 item$529.99

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 2 Max Smart Extra Battery adds 2,048 Wh of LFP capacity per unit. Connect up to two modules to a DELTA 2 Max to reach 6,144 Wh for extended home backup and RV living, or pair one module with a DELTA 2 to triple its capacity to 3,072 Wh.

Built with automotive-grade LiFePO4 cells and an integrated front LCD display, the battery links via the included XT150 cable and automatically balances charging and discharging with the host power station.

Compatibility

Product details

Brand: EcoFlow
Category: Batteries
Compatible with: DELTA 2 / DELTA Max / DELTA 2 Max (up to 2)
Weight: 41.9 lb / 19 kg
Dimensions: 18.3 × 9.3 × 11.1 in (464 × 235 × 283 mm)
Model: EFD350-EB
Capacity: 2,048 Wh (51.2V, 40Ah)
Cell chemistry: LiFePO4 (LFP)
Cycle life: 3,000 cycles to 80%+ capacity
Extra battery port input: 51.2V DC, 2,000W Max
Extra battery port output: 51.2V DC, 3,200W Max
Charge temperature: 0°C to 45°C (32°F to 113°F)
Discharge temperature: -10°C to 45°C (14°F to 113°F)

In action

Reference setups & real-world use

EcoFlow DELTA 2 Max Smart Extra Battery (2048 Wh) — 4–6 kWh Home & Garage Emergency Stack — 4–6 kWh Home & Garage Emergency Stack
Stacked with DELTA 2 Max in the garage to keep a full-size refrigerator, lighting, and laptop workstation running through extended blackouts.

EcoFlow DELTA 2 Max Smart Extra Battery (2048 Wh) — Dual-Battery Workshop & Freezer Backup — Dual-Battery Workshop & Freezer Backup
Up to two 2,048 Wh LFP modules connect via XT150 cables to scale a single DELTA 2 Max up to 6,144 Wh.

Highlights

Why it's worth it

2,048 Wh modular LFP expansion — stack up to two units on DELTA 2 Max for 6,144 Wh total capacity
Cross-compatible with DELTA 2 (up to 3,072 Wh), DELTA Max 2000 (up to 6,064 Wh), and DELTA 2 Max
Long-lasting LiFePO4 chemistry delivers 3,000+ cycles to 80% original capacity
Plug-and-play XT150 interface syncs charging, discharging, and app telemetry with the main station
Integrated front LCD display shows state-of-charge, input/output power, and remaining runtime
Multi-layer BMS protection against overvoltage, overload, overtemperature, and short circuits

In the box