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It supports communication with devices such as PCs and NAS, and alerts the device to save data in the event of a power outage.
No, it can only connect one Extra Battery.
The battery cells and BMS in EcoFlow RIVER 3 and RIVER 3 Plus support IP54 protection, providing extra peace of mind during use. However, the entire product is not waterproof.
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: 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).