Ok, so I had two choices use the USB Mic with dead cat until the battery got low or just go with the internal mics and use a USB power bank...
So I decided to try the internal mics.
First the internal mics are very good IF there is no wind, if there is wind all bets are off it's loud.

The good news is I recorded for 4 hours straight in 1080p 24fps ultra wide and it never even got warm (1080p would overheat in the house after a couple of hours)
outside air temp was 61 degrees but it was really windy.


I willl post the video later but here are some low light screen caps for you to check out:
(note I had to run these through affinity photo to get the size below 2mb)

Hello there snorkel. Good day and thank you for posting these cool photos you have captured using your DJI Action 2. Great shots and have a nice day.

Lovely sunset.  

Very nice shots from the Action 2.  Glad to hear you experienced no overheating issues.