EcoFlow · Batteries
EcoFlow RIVER Extra Battery (288 Wh)
Works with
RIVER (original)
EcoFlow RIVER Extra Battery (288 Wh): compare specifications and model compatibility. View expansion battery details, photos and support information at 326energy.
Use
What it adds
The EcoFlow RIVER Extra Battery adds 288 Wh of energy storage to the original EcoFlow RIVER portable power station, doubling its capacity from 288 Wh to 576 Wh in one integrated unit.
Instead of using an external cable, this module attaches directly to the underside of the original RIVER chassis using the included mounting hardware, keeping the station portable with a single carry handle.
Compatibility
Product details
- Brand
- EcoFlow
- Category
- Batteries
- Compatible with
- RIVER (original)
- Weight
- 5.5 lb / 2.5 kg
- Dimensions
- 11.2 × 7.1 × 2.3 in (285 × 180 × 59 mm)
- Model
- EF4Max-eb
- Capacity
- 288 Wh (28.8V)
- Cell chemistry
- NCM Lithium-ion
- Cycle life
- 500 cycles to 80%+ capacity
- Connection interface
- Direct bottom-chassis dock (4 mounting screws)
- Charge temperature
- 0°C to 45°C (32°F to 113°F)
- Discharge temperature
- -20°C to 45°C (-4°F to 113°F)
In action
Reference setups & real-world use
576 Wh Integrated Bottom-Mount Workstation
Bolted flush to the underside of the first-generation EcoFlow RIVER chassis to double onboard energy from 288 Wh to 576 Wh with zero external cables.
Campsite Cooler & Solar Recharge Setup
Recharges in sync with the host RIVER station from portable solar panels while running a 12V camp cooler as a single one-handle unit.
Highlights
Why it's worth it
- Doubles the original EcoFlow RIVER capacity from 288 Wh to 576 Wh
- Integrated bottom-mount design bolts directly to the base of the RIVER station with no external cables
- Lightweight 5.5 lb (2.5 kg) attachment preserves one-hand portability
- Charges and discharges in sync with the host RIVER station across AC, solar, and car inputs
- Built specifically for the first-generation EcoFlow RIVER (not compatible with RIVER 2 or RIVER 3 series)
In the box
What's included
- EcoFlow RIVER Extra Battery (288 Wh)
- Long Mounting Screws (×4)
- Cross Screwdriver
- User Manual
Keep browsing
More compatible accessories
EcoFlow RIVER 3 Plus Extra Battery EB300 (286 Wh)
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 3 Plus Extra Battery EB600 (572 Wh)
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.
EcoFlow RIVER Pro Extra Battery (720 Wh)
Works with: RIVER Pro
Doubles EcoFlow RIVER Pro capacity from 720 Wh to 1,440 Wh in a matching portable form factor. Connects via the included expansion cable and charges or discharges in sync with the host station.