MG Siegler, "A Better Battery":
Battery technology is progressing much more slowly than all of us would like. But I have to believe that at some point in the next five years, we’ll get to a place where we really can use our phones all day without worrying about recharging.1
As I tweeted yesterday, I feel like I've been getting worse battery life on my iPhone 5S lately. It's perplexing because I don't think I'm using it any differently, and the phone is working great, as always. On the other hand, my iPad Air's battery seemingly lasts forever. It's awesome.
Hopefully Apple can improve the iPhone's battery sooner than later.