In the annual replacement tide, CPU, GPU, camera, RAM and ROM are manufacturers love snowless places, is also the biggest change in recent years, the progress. Battery technology progress, in contrast, is something of a dwarf, a year is only about 10% of the energy density of ascension, also can only be used when manufacturers to introduce SONY/samsung batteries to foil gives the feeling of the tall. In actual user experience, the battery life is obvious, after all, life is not enough, again won't strong performance.