EcoFlow River 3 EB300 Smart Extra Battery, 286 Wh, Black

The EcoFlow River 3 EB300 (EFEB300) is an expansion module designed to increase the energy capacity of the EcoFlow River 3 and River 3 Plus power stations. It adds 286Wh of capacity, extending the operational runtime of connected units during off-grid use or power outages. The module uses Lithium Iron Phosphate (LiFePO4) cells for thermal stability and long-term durability. Unlike standard external batteries, this unit integrates with the primary station's power management system, allowing users to scale their energy storage without replacing existing hardware. It connects to the River 3 ecosystem via a dedicated battery interface.

The module features a 140W USB-C port, which can charge high-demand electronics such as laptops directly. It weighs 3.5 kg and measures 224 x 234 x 110 mm. The battery is rated for 3,000 charge cycles before its capacity drops to 80% of its original level. Its black housing matches the aesthetic of the River 3 series, and its 28V output ensures compatibility with EcoFlow interfaces.

• 286Wh energy capacity: provides enough power to charge a 60Wh laptop battery four times.
• LiFePO4 battery chemistry: offers high thermal stability.
• 140W USB-C PD port: enables high-speed charging for compatible devices without using the main station inverter.
• 3,000 charge cycles: retains 80% capacity after years of daily discharge and recharge.
• 3.5 kg weight: designed for portability in the field.
• Dimensions of 224 x 234 x 110 mm: compact enough for storage in vehicles or gear bags.
• Dedicated battery interface: enables the expansion unit to communicate with the main station for integrated energy management.