Hi @marvin.
If the voltage is between 4.5 and 4.9 you ‘only’ get a warning. It will still work, but nevertheless should be looked into.
Which power module are you using with the Pixhawk 4? The officially supplied one? What else did you attach?
For the Pixracer I think we also use that combination, but I haven’t noticed any issues. Since it’s right at the limit and generally looks stable, you can set the circuit breaker to disable the warning via CBRK_SUPPLY_CHK parameter.
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