I was using the camera for 4K video and thought to power with the Sony power supply via usb cable to avoid changing the battery. To my surprise, the camera shut down with "battery exhausted" message. When I contacted Sony support, I was told the supplied usb / ac charger would not power the camera and I would need the Sony W20 unit with dummy battery. But it seems to me one of the features of the mk2 was being able to power through usb.
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