For me it was 2 to 3 weeks of battery. Smartphone batteries are just miserable, and I'd happily take a heavier & thicker phone to get better battery life.

Yep, that's the one I have. I honestly rarely get to 50%, but you stop feeling guilty about leaving the screen on for too long and it's just more pleasant to use never having to worry about the battery. + it's incredibly cheap and still super thin