Battery life has always been a huge limiting factor for mobile devices. Batteries are obviously among the most critical components in smartphones and tablets, but battery technology simply hasn’t progressed as quickly as tech has in other areas. The result is a new generation of sleek and slim smartphones with batteries that struggle to make it through a full day on a charge as big, beautiful displays and insanely powerful processors command an increasing amount of power. If the battery life on your current smartphone just isn’t cutting it, a series of tests suggest that Samsung’s upcoming Galaxy S5 flagship phone could be just what the doctor ordered. The all new Galaxy S5 launches in just a couple of weeks — unless you