
EcoFlow · Batteries
Works with
DELTA Max / DELTA 2 / DELTA 2 Max
EcoFlow DELTA Max Extra Battery (2016 Wh): compare specifications and model compatibility. View expansion battery details, photos and support information at 326energy.
Use
The EcoFlow DELTA Max Smart Extra Battery adds 2,016 Wh of capacity to the DELTA Max, DELTA 2 Max, or DELTA 2 portable power stations, scaling a single DELTA Max up to 6,048 Wh with two connected units.
It features a bright front LCD screen for live battery status and can be recharged either through the host power station (AC, solar, or car) or directly from the EcoFlow Smart Generator during prolonged grid outages.
Compatibility
In action

Home Kitchen & Refrigerator Outage Backup
All-charcoal EcoFlow DELTA Max Smart Extra Battery (EFD310-EB) connected to DELTA Max via the XT150 cable to add 2,016 Wh of emergency storage for refrigerators and kitchen appliances.

6,048 Wh Dual-Battery Utility Room Stack
Two 2,016 Wh DELTA Max Smart Extra Battery modules daisy-chained to DELTA Max via XT150 cables for 6,048 Wh of home emergency backup.
Highlights
In the box
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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.

Works with: RIVER (original)
Doubles the original EcoFlow RIVER capacity from 288 Wh to 576 Wh. Bolts directly to the underside of the first-generation RIVER chassis with the included hardware for a single-handle, cable-free setup.

Works with: RIVER 3 Plus
Adds 572 Wh of LiFePO4 capacity to the RIVER 3 Plus, tripling total system storage to 858 Wh. Clips beneath the station via wireless Pogo Pin contacts and features a built-in 140W bidirectional USB-C port for standalone use.