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Fatshark hdo2 turns off at 7.8v
#16
See if you wiggle the battery connector to the Hdo2, whether it turns off.
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#17
It's strange that everything works from the PSU but not the battery. If it was a loose socket or failing solder on the barrel connector in the goggles it should behave the same from both the PSU and a LiPo.

@OP - Does your PSU not go down below 5V? I find it odd that the screens never power off when powered from the PSU. Also, are you using the same barrel connection cable when using the PSU and a LiPo, or are they different cables?
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