I recently changed my distro to Bazzite expecting it to work well on a laptop since it's supposedly optimized for handhelds. While it "just works" and I had no hardware problems, it still required tweaking to get the battery life anywhere close to what it would be in Windows. "Normal people" would still need someone to support them with the installation to get it to work well for their machine.
The website of Bazzite says it comes with 'cpu-governors that are optimized for gaming'. A governor basically decides when and how to change the power level of your CPU. If a core is experiencing high load, it might increase power and clockspeeds to compensate. Of course this draws more power, so 'optimized for gaming' kind of means unoptimized for battery. I think most distros come with a 'power-saver' governor by default. This option should be available in power settings called 'governor' or 'power profile' or something like that.
Also, I recently switched from KDE Plasma (one of the Bazzite options) to xfce4 and I've seen massive gains in battery life, about 1-2hrs extra. I don't remember how many hours I used to get on win10 on this laptop, but I'm sure it has never been as good as this.
