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Accessories › EcoFlow RIVER 3 Plus
EcoFlow RIVER 3 Plus accessories
The add-on batteries that EcoFlow itself sells for the RIVER 3 Plus. We list an accessory only where the maker states the pairing, and show that statement, its source and the date we last confirmed it.
Add-on batteries
| Battery | Price | Capacity with one added | Fridge runtime with it (est.) | Why it's listed | |
|---|---|---|---|---|---|
| EcoFlow RIVER 3 Plus Smart Extra Battery (EB300) 286Wh | $159 2026-10-11 | 572 Wh from 286 | 9.3 hrs from 4.6 hrs | EcoFlow's listing says so: “RIVER 3 Plus Smart Extra Battery” (source, confirmed 2026-10-11) |
Capacities are EcoFlow's published figures. Fridge runtime is our estimate (full-size fridge, 85% inverter efficiency), not a test. EcoFlow says the RIVER 3 Plus can be expanded to 858Wh in total.
Back to the EcoFlow RIVER 3 Plus, or size a whole setup with solar and add-on batteries in the home backup planner.