1) there were already four battery case, which are ideal for use in Storio 2 - also by the durability
2.) the charger is pretty small and compact. The cable can be removed, allowing it to be very space-saving also taken in the case Storio2
3.) compliant, we have additionally bought the Amazon house brand with another battery pack (- to have a set of batteries in use and loaded a set ready waiting ...)
We would buy the charger again and again!