...come out with accessories like those bumper gels packed with batteries designed like those for Iphones or Galaxies, to be used for Z3 with totally un-removable battery?
Or is there such a thing already? Like the one for Z10?
http://img.tvc-mall.com/uploads/deta...-Z10-07A-1.jpg
However... it looks kind of awkward with the USB attaching part protruding like that...