The adapter is made of rubber-like material and has, when your iPhone is to provide a measure of protection for the casing, but unfortunately not for the display.
But that also ends the already meager benefits, because the iPhone is visually enhanced by the adapter in any way. Those like me who carries around his apple mobile phone rather eg in a folding leather case, not all be the same protzermässig "precious" to rub smartphone under your nose, and because it is easy and the better protection, must decide. Either adapter or bag because the bag is (like most bags or cases available for the iPhone) fit for the iPhone, but does not account for accessories such as the Duracell adapter.
So to charge out of his pocket and reinfrickeln into the adapter. In the time I have but quickly connect a charging cable. To synchronize the adapter must be removed again, because it has the connection.
Conclusion: adapter top and down again. This sucks, sucks, sucks. I also have my iPhone rather in my leather bag. Looks better and because it can remain for charging as well as to synchronize.