When I want to go /P for portable operations away from QRA, I've the same issues each times.

I've got my FT818, but the battery pack doesn't last for hours, so I need to bring a battery pack with me.

Also, I do most of the time digimodes like JS8, PSK31… So for that I need too bring my RPI4, with my cables to connect to the soundcard and for the CAT control + a step down to power the RPI from my main 12V battery pack.

And then, you need to unplug everything each time, and replug then on field, so it's the sort of things that are quite time consuming and I think with lot of cycles/operations that can damage the connectors and can lead to issues for using the setup.