Backup batteries? Got ’em. Mobile charging stations? Pfft. I have enough devices for charging other devices that picking one to take to events has become a process all its own. What I don’t have, or didn’t have at least, was a mobile charging station that could keep my beer cold for half a day. River, by EcoFlow, changed all that. It’s not what you’d call practical, at least not in the sense that you can stow it in a pocket or backpack. After all, it’s about the size of a car battery and tips the scales at a whopping 11 pounds.…

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