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No, it can only connect to one extra battery.
The AC output inverter conversion efficiency can reach up to 93%.
EcoFlow RIVER 3: Not supported. EcoFlow RIVER 3 Plus: Can be expanded by connecting to EcoFlow RIVER 3 Plus Smart Extra Battery EB300 (286Wh) or EcoFlow RIVER 3 Plus Smart Extra Battery EB600 (572Wh).
EcoFlow RIVER 3 and RIVER 3 Plus support USB-C output up to 100W but do not support charging via USB-C. The EcoFlow RIVER 3 Plus Smart Extra Battery EB300 (286Wh) and EcoFlow RIVER 3 Plus Smart Extra Battery EB600 (572Wh) support both charging and discharging via USB-C up to 140W.
EcoFlow RIVER 3: AC standby power consumption ≤ 4W, DC standby power consumption ≤ 2W. EcoFlow RIVER 3 Plus: AC standby power consumption ≤ 5.5W, DC standby power consumption ≤ 2.3W.