I have a System76 Pangolin 11 with the Ryzen 7 and the battery life is trash. It would die on me during meetings from a full charge if I was sharing my screen. Not blaming System76 on this one, its probably the AMD chipset all things considered.
Replaced it with the Thinkpad X13 Gen 2 and love it. Easily gets 8 to 10 hours on OpenSUSE, and everything just works.