That would be great. I'm a heavy user, about two to three hours of screen-on time per day and six to eight hours of Spotify on the background. I have bad cellphone reception so it is constantly searching for signal and trying to reconnect the VPN. I have to recharge at around 17:00 on a normal day. Device is a couple months old and at 96% battery capacity.

A phone as large as iPhone XR with iPhone SE's thickness would be pretty hefty…

The iPhone XR is thicker (8.3mm) than the iPhone SE (7.6mm)

No, no. The size of the SE but just a little thicker so the battery lasts longer. That's the only advantage big phones have in my view.

That's starting to get pretty thick…maybe it might be better if Apple made a battery case for iPhone SE?

The SE is already thinner than the XR by 0.7mm, and 0.1mm thinner than the XS/XS Max.

Sure, but since it's smaller it would be far more "chunky".

I think 1mm would add quite a bit of capacity