You could consider a chromebook. I think you can get them or many of them to run linux stuff and they have great battery life and would meet you use case for the most part…
This is an older link now the way things progress but you could explore it…sounds like you are not trying to make this an editing machine… price on these is usually good How to install Darktable 4.0 on a Chromebook
Quite a range of specs on them…
But some also flip over so could be tablet like as well… I saw some with Ryzen variant CPU’s
https://www.linuxmadesimple.info/2019/08/all-chromebooks-with-linux-apps.html