I believe the Pixhawk 4 Power 2 connector is intended to be a redundant power input. I tested this out supplying 5V on power1 and power2 - and then removing the power 1 connector. I saw the power at the Pixhawk connector droop to 3.73. The Pixhawk4 appeared to remain powered.
From what I can find online, it looks like the minimum Pixhawk 4 power is 3.7V. Is this correct? I am concerned that as I load up the Pixhawk 4 devices I could see a greater voltage drop such that the Pixhawk 4 might lose power when transitioning from Power1 to Power 2. Anyone have any expertise on this? Thanks!