Among my mini & micro USB devices, I have a Motorola RAZR that I want to charge in my 2.1 Amp USB car cigarette adapter.
Everything charges with this setup EXCEPT the Motorola RAZR V3.
Digging into why, apparently Motorola uses a 5-wire cable instead of a 4 wire cable.
How do I find a 5-wire USB2.0-to-mini-USB cable?
Googling, I find tons of cables, but none SAY how many wires they have.