That was the whole purpose of putting it in a bottom. The thing works several months on a single charge and it takes just a couple of hours to recharge. And it starts giving notification at least a day before battery's depleted.
It's not aesthetics over function mantra, but realisation that they can't be decoupled or developed by separate divisions.
That's what concerns me about Ive leaving. He and Jobs evidently had enough courage to ignore public opinion to make things the right way and in most cases it turned to be excellent decisions. With no successor I'm seriously afraid they'll eventually resort to safe decisions and become another Samsung/MS/Android/whatever..