The EcoFlow RIVER 3 EB300 Extra Battery is a 286 Wh companion pack designed to expand a RIVER 3 Plus power station from 286 Wh to 572 Wh of usable storage. It weighs 3.3 kg and keeps the same 23.4 x 22.4 x 11 cm footprint as the base unit, so a portable setup stays portable when the two are stacked. A single 140 W USB-C output on the pack itself means it can also work as a stand-alone fast-charging brick for a phone, tablet or laptop. Built around LiFePO4 chemistry, the cells are rated for 3000 cycles to 80% of their original capacity, roughly a decade of daily cycling.

• 286 Wh of usable LFP storage that doubles a RIVER 3 Plus reserve to 572 Wh
• 3000 cycles to 80% capacity, giving a long and predictable service life
• 140 W USB-C output so the pack can charge devices without the host station
• Compact 23.4 x 22.4 x 11 cm frame and 3.3 kg weight for easy transport
• Operating range of -10 °C to 45 °C for discharge and 0 °C to 45 °C for charging
• LiFePO4 chemistry chosen for its long life and stable thermal behaviour
• 5-year warranty in line with the RIVER 3 Plus platform

Key specs

• Capacity: 286 Wh
• Chemistry: LiFePO4 (LFP)
• Cycle life: 3000 cycles to 80% capacity
• USB-C output: 140 W max
• Weight: 3.3 kg
• Dimensions: 23.4 x 22.4 x 11 cm
• Discharge temperature: -10 °C to 45 °C
• Charge temperature: 0 °C to 45 °C
• Warranty: 5 years

The EB300 is a practical way to extend runtime for a longer camping weekend, an off-grid workday in a van, or a home backup buffer that lasts through a longer outage rather than only a short one.