I purchased some additional microUSB cables for use with my Droid at work and home so I'm not carrying one around all the time. I've found that the third party cables will not charge the Droid when plugged into the AC plug. The cable supplied by Motorola works fine, so I know it's not the AC plug. The cables do work as data connections when plugged into my laptop. Did I just buy crappy cables, or is there something special about the Moto cable?