The iPhone 17 Air and Galaxy S25 Slim will be ultra-thin phones with smaller batteries - here's what it might mean for battery life.

It's already been a banner year for battery life, with newly released devices like the OnePlus 13 and OnePlus 13R producing impressive results in our battery testing. And soon, the new Galaxy S25 models from Samsung will have their chance to show just how long they can last on a charge.

Samsung is all set to unveil the Galaxy S25 series of smartphones on Jan. 22. As expected, the lineup will consist of three models: the Galaxy S25, Galaxy S25+, and Galaxy S25 Ultra. Reports suggest the lineup will also include another model dubbed the Galaxy S25 Slim,