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In September, the AEG SolarCube Pro from our review drained while it was switched off, and the firmware update broke off every time at about 21%. HYXi, the manufacturer, confirmed two faults in the old firmware, and neither of them was in the hardware. On the new firmware, the same unit stood off the grid for 23 hours with the button off, and went from 49% to 49%. Here is what happened, why, how to really switch it off, and three corrections to the review and the update.
