EcoFlow · Batteries
EcoFlow DELTA 2 Max Smart Extra Battery (2048 Wh)
Works with
DELTA 2 / DELTA Max / DELTA 2 Max (up to 2)
EcoFlow DELTA 2 Max Smart Extra Battery (2048 Wh): compare specifications and model compatibility. View expansion battery details, photos and support information at 326energy.
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
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.
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
What's included
- EcoFlow DELTA 2 Max Smart Extra Battery (2,048 Wh)
- Extra Battery Cable (XT150)
- User Manual
Keep browsing
More compatible accessories
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Works with: RIVER 3 Plus
Adds 286 Wh of LiFePO4 capacity to the RIVER 3 Plus (572 Wh total) via cable-free Pogo Pin stacking. Rated for 3,000+ cycles to 80% capacity and includes a 140W bidirectional USB-C port for standalone charging and device power.
EcoFlow RIVER Extra Battery (288 Wh)
Works with: RIVER (original)
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EcoFlow RIVER 3 Plus Extra Battery EB600 (572 Wh)
Works with: RIVER 3 Plus
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