Battery life was one of the iPhone SE's biggest weaknesses, ignoring its low-resolution display. Supposedly, the new iPhone SE addresses one of its predecessor's pain points with improved battery life that could match the iPhone 12 mini. Still, the iPhone 13 and iPhone 13 mini should last longer on a single charge than the new iPhone SE.
https://www.notebookcheck.net/Apple-outlines-battery-improvements-in-the-new-iPhone-SE.607550.0.html