@thibaultamartin I like the laptops sold by @novacustom . Approximately 6 hours of battery, hardware fully supported, open source firmware and nice build quality. They're also great in terms of maintenance and replacement parts.

@thibaultamartin I know my tastes are different from most people (e.g. I generally prefer larger laptops), but I'm pretty happy with the System76 Pangolin that I use, and if I had to buy a new laptop, I'd probably get a newer version of the Pangolin. There was a time when I was ThinkPad-only, but nowadays, I personally don't see any reason not to give money to a company that explicitly supports Linux. I chose System76 because they're in North America, so they're more local to me, but if I was in Europe, I might look at something else. There seems to be more options in Europe.
I've never had good luck with battery life, though, with any of the laptops I had. I'm usually happy if I end up with about half the advertised battery life.

@thibaultamartin

I might lose here on GOOD battery life, but a use Lenovo Legion AMD has been very good to me. Mine runs a couple of hours at 4 years old, more than enough for me. This replaced an earlier, newer budget Lenovo that had excellent battery life and light weight. Gamer laptops are heavier, hotter, shorter battery life but much faster, incredible screens, and oodles of cool features.

Otherwise, any AMD has been a good start. Intel adds nothing but cost.

@thibaultamartin The, ahem, canonical answer for this is "Refurbished Thinkpad plus replacement new battery."

close-to-current-gen Thinkpads tend to be very well supported, and replaceable batteries mean they'll be long-lived.

@thibaultamartin ThinkPad T14 with AMD CPU. One of the few laptops that I know with HSI level 4 :)