If battery life is what you're after, looking at a 1.5 generation (soon to be 2.5) old 35W Ryzen that gets 11 hours of battery life should give you clues. Ryzen 7000 mobile should be announced in January, and those will utilize TSMC 5nm.

https://www.laptopmag.com/features/how-amd-ryzen-whooped-int...

https://www.tomshardware.com/news/amd-ryzen-4900hs-battery-l...

Or 0.5 generation ago 15W Ryzen getting 17-20 hours...

https://youtu.be/An3OpQ7v0rs?t=546