Steam Frame needs 27-45W of power to run, and it can run off an additional battery
(media.piefed.social)
This photo shows that you need at least 9 volts to wake up the battery controller after it being set to shipping mode, it has absolutely no indication of any power usage requirements for the device to operate. Even if the power usage of the device falls into this range, it is a coincidence and had nothing to do with this image.