The volume of the Unihertz Jelly 2 (77.4cm³) is more than 13% larger than the volume of an Apple iPhone SE (2020) (68cm³)! I consider that to be a good reminder that there is no free lunch: If you build such a small smartphone, you suddenly don't have enough space behind the screen for a flat battery anymore, forcing you to increase the depth of the device to fit an adequate battery. You then end up with a device wit…
The iPhone SE was a good size but had terrible battery life from day one.
I’m now using an iPhone 7, and it too has terrible battery life, with the added benefit that if I take it out of its case I cannot hold on to it for a sustained period because it’s so thin and has no real edges to speak of, just large diameter radii.