I think it would be quite hard to increase the batrety capacity for it to remain in such form (i.e. Sleek design in such similarity of the form of the icon) the other thing which i think is more important is the security of the batrety to the iPhone. it is very loose when I attached it. it fell down to the ground twice when i was using it today! ... ...they should be making the connection to the the iPhone much more securer to the iPhone!!!