Why does it take so long for my phone to charge when using a USB extension cable?
I can usually charge my phone from almost dead to completely full in a few hours when using just the USB cable that came with it, connected to a wall outlet. When I use a USB extension cable to give me more freedom to move around with the phone while it's charging, however, the cycle takes significantly longer (sometimes I can leave it connected all night and it's still not fully charged in the morning). The cable is supposed to be rated for high speed data transfer, but I wouldn't think that has anything to do with electrical current. Does anyone know why connecting the extension cable would make such a difference in charging times?