Samsung's ultra-thin Galaxy S25 Edge flagship has a smaller battery than the S25, and it's definitely bad news for screen-on time.

When I first heard Samsung was bringing back the Edge name as a new super-thin member of the S25 family, all I could think was: Why? Honestly, I thought phone makers had gotten over their hunger for thinness nearly a decade ago.

In order for Samsung to achieve its engineering marvel with the Galaxy S25 Edge, the company had to cram a much smaller battery into its svelte frame. This turns out to be a 3,900 mAh battery cell, which is actually a smidge smaller than the 4,000 mAh battery in the regular Galaxy S25.