What's the battery life like on linux?
That said, the spec sheet MobileMark benchmark says battery life is as good as 14.3 hrs in max battery setting on WUXGA Low Power (non-touch), Win 11, 52.5Wh battery, versus a performance mode getting 5.0 hrs on 2.8K OLED (non-touch), Win 11, 39.3 Wh battery. With 'local video playback' lasting longer. So I guess it's very hardware and use-case specific. (https://psref.lenovo.com/syspool/Sys/PDF/ThinkPad/ThinkPad_T...)
Two cool things that TLP does is allow you to set battery charge thresholds for better battery longevity (I limit mine to 80%), the other being automatically changing the energy performance preference (EPP) in the amd-pstate driver, so if you're on battery you could get it to automatically switch to power saving or balanced powersaving etc. I get an 8-10 hr battery life even with the 80% cap capacity, with several MS webapps running in Edge (Wayland), including Teams and Outlook, VS codium and Firefox running in the background.