Does anyone know how interchangeable the power adapter is with other usb devices? I had left my usb cable at the office and tried to charge the phone with the power adapter to my bluetooth headset. My phone didn't seem to like this (the led kept flashing and the phone said (I think) that it was charged). No damage, but I think that adapter wasn't powerful enough. Anyone know if that is the case? Would using the D2 outlet adapter on another device destroy that device?