Yeah folks are definitely forgetting that battery life != phone screen size. It's much more complicated than that.
I had a 6S and I couldn't stand the battery life (or size). "Down"graded to a 2016 SE and the battery life was leaps and bounds better -- plus, it didn't shut itself off outside on cold days.
Based on Apple's spec page, it does look like the Mini has worse battery life than the 12. The real question is:
- how is standby battery life?
and
- what kind of impact does 5G have?
The number's on Apple's site are a great deal better than the 2020 SE's battery life, so I think we might have a good balance here. Hopefully.