EcoFlow RIVER 2 MAX - Portable Power Bank - UK Spec.EcoFlow RIVER 2 Max Portable Power Bank UK Spec. The EcoFlow RIVER 2 Max is fully charged in only 60 minutes, beating the industry standard, making the River 2 Max 5x faster than other portable power stations on the market and 38% quicker than previous generations of the same model. The RIVER 2 Max has an AC output of up to 500W. Need to power a hoover or kettle? Crank it up to 1000W using X Boost mode to allow you to run up to 80% of essential