Ok, that you have to buy an extra charger is somehow nonsense. I have the recommended equipment ordered, and that works perfectly. From the terminals ago might be well also another cable (mainly power on one side and mini-USB on the other side), but when tested with a HTC cable I noticed that the blue lights flicker weird, which is at the original charger not the case. So maybe better to bite the bullet and to buy!
What bothered me more is that in the description of the iPhone 5 mitbeworben, but included * no * cable (only one for iPhone 4 and older, as well as a cable with mini-USB for example, HTC). So there you have to take care of himself, and therefore also a star deduction.