After all these years, battery life is still one of the biggest pain points when it comes to smartphones. Battery technology is always improving, of course, but not nearly fast enough to offset the various new tech that drains the juice from our smartphones. Especially where the iPhone is concerned, the phone’s design is also constantly getting slimmer so there is less space to fit a battery with each new generation. But don’t despair — we’re here to help. Apple’s iPhone 5s lasts longer on a charge than any iPhone model that has come before it, but when it comes to battery life more is always better. This is why features like Samsung’s new ultra power-saving mode on the Galaxy