The EcoFlow River 3 Plus EB600 is an expansion battery designed to pair with the River 3 Plus power station, adding 572Wh of usable capacity via LiFePO4 chemistry with a 10-year lifespan (~3000 cycles). It operates independently or docked to the main unit for seamless capacity expansion.

Key specs: 572Wh LiFePO4 · Standalone operation · Built-in 140W USB-C PD (input & output) · Expandable design · Compact, lightweight form factor relative to fixed stations.

Use case: RV/van life expansions, camping multi-day trips, stacking capacity without adding a second full station. Best for users who already own a River 3 Plus or want modular, swappable power without weight penalty.

Trade-offs: Not a standalone AC outlet station—relies on companion device for 110V needs. Limited to USB-C and 12V outputs when used alone. Price-per-Wh sits above entry-level standalone units but below flagship expansions.