I can get a solid 2-3 hours on Baldur’s Gate 3 (with a bunch of mods) before I have to worry about plugging it back in. All the other games I play right now are the other ones that you’ve mentioned are older games that really don’t drain the battery at all. I’ve used mine pretty consistently since November December of last year, and I haven’t really noticed a drop in performance of battery life.
I really wanna try some of the newer games that look great like that Clair Obscur 33 game to see how it compares.
Some of the Yakuza games seem to benefit a lot from a TDP limit. Seems like you can restrict the power usage quite a bit without any decrease in performance.
Black Mesa, Witcher 3 on high graphics quality setup. Generally, I tend to lower the quality just to increase the battery life: anyways I usually don't notice very much of graphical improvement on high setup.
A lot of Sony's games (God of War, Spiderman, Last of Us, Horizon Zero Dawn) run pretty decent but will max out the power usage. Expedition 33 has been my recent favorite game, and it definitely brings my OLED down to it's min battery life of about 2.5 hours.