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Affordable Battery for PowerStream and Powerstation! After a few hours of operation with the EcoFlow Delta 2 Max and the PowerStream in the previous review, today we would like to take a look at the Delta 2 Max Smart Extra Battery 2kWh extra battery on Funkyhome.de. First of all, although it sounds like a pure upgrade battery of the Delta 2 Max Powerstation to 4kWh, in many cases it may even be a low-cost competitor to the EcoFlow Powerstation!