I’m not sure if you can change the temperature variable on the THETA V. It is a Qualcomm SnapDragon 625 platform that uses the Android API that you can find on the Google Android developers site. If you can find someone doing this on a standard Android phone, there’s a chance that it may work on the THETA V. I suggest searching for techniques to do this on a normal Android phone before you buy a THETA V.
This guy put a switch into the THETA S.
You may be able to research battery bypass hacks for normal phones or use a electrical test meter to figure out the best way to reroute the power.
I somehow got some information about the pins of the THETA V here:
Pay attention to the electrical resistance of the center pin. You may be able to alter the resistance with an inline resistor and thus the temperature reading from the battery.
- there are 3 electrical connections on the camera to connect to the battery
- the middle connection is temperature resistance.
- use 100k Ohm as 25 degree C and 4.2V with 1A capability
- test the camera with a constant power supply from an adjustable bench power supply and adjust the voltage and ampere to cheat the power manager IC on the camera
The above solution is untested. As you are using a custom case, you may be able to test the power bypass easily and see if it has an impact on your usage.