I guess this is why I was down-voted at first, but it really isn't a laptop if it doesn't have a screen and I don't need one. I think we will see hacks with the pi 400 soon that will have a battery anyway, or one can just disassemble it and attach a power bank to it anyway so I guess the solution is already there.

I'm hoping some company takes the new Compute Module 4 and does that. Would be great as a thin client + browser only machine.