Re: can i use any miniusb to charge my mophie?
The Mophie cases use microUSB connectors, NOT the miniUSB. But, yes, you should be able to use any combination of microUSB cable and 5W charger. Of course if it refuses to charge, the issue could be with any of the components - the charger block, the cable, or the Mophie itself.
Originally Posted by iMore Question
What did your brother say about the Mophie? Was it working or not? Try changing out the cable and charger block and see if you get the same results. Without knowing the quality of either the cable or the charger, it's hard to say what you are getting and where the problem is.