So I lost the cord to my Juice Pack Air (for iPhone 4). I tried a cheap Micro USB adapter I picked up at CVS, but it only charges, doesn't sync. Including shipping, an OEM cord from Mophie.com comes to about $20, which seems excessive. So my questions are: does anyone have experience using non Mophie cords to charge Mophie Juice Packs (especially the Air for iPhone 4)? Also, has anyone successfully used the Mophie cord for one Juice Pack with another one? Thanks!