I've got a Lenovo ThinkPad X1 Carbon 10th generation, which, from the start, IIRC was criticized for not having the best battery life, I think, because of its processor (12th Gen Intel Core i7-1280P × 14).
I thought I had read that using a more recent kernel might help the lowish battery life problem (I'm using 6.11.0-24-generic at the moment), but it doesn't seem to help much, if at all.
I tried using tlp, which meant uninstalling power-profiles-daemon, but this just made my laptop run hot, and also screwed up my battery when I tried to set charging thresholds (had to reset it by using the emergency pin hole), so I probably won't be trying that again. Reinstalled power-profiles-daemon, and now have it on power saver; so back to normal now, not running hot, but battery life still isn't great.
Anything else I could try? There's auto-cpufreq which I used for a while on an older laptop, but that was quite a while ago . . .
I like to use the arch wiki to set up laptops. They are specifically written for arch, but the information can translate to basically any Linux distro
https://wiki.archlinux.org/title/Lenovo_ThinkPad_X1_Carbon_(Gen_10)