I'm pretty sure the Framework Desktop has zero minutes of battery life.

It's a desktop mini PC, there's no battery. There are laptops with the same Ryzen AI 395+ CPU+RAM, but I'm doing heavy rendering / computing (actually I got it for rendering work, not AI stuff) and laptops are a bad form factor for that.

Sleep mode... works? I actually turned it off because I have long-running processes and it only uses 4W at idle with the screens off. It's 8W at idle with a 4K 160Hz monitor and a 1440p 144Hz monitor, which IMO is Alien Fucking Technology, considering there's a > 5GHz 16 core CPU with 128GB RAM (4 channels like Threadrippers, vs 2 for normal desktop CPUs) in there.

Obviously it has no battery, being a desktop. Regarding sleep, under Debian 13 it supports S0 (s2idle) only, which works without issue.

    $ cat /sys/power/state
    freeze mem