I'm very new to this so be gentle. I have a small fan that runs on 1 AAA battery and, because the case is difficult to get into, I'm attempting to use a rechargeable AAA battery in it's place attached to a USB wire to charge it with a male USB connector set outside of the fan unit. So far I have soldered a male mini USB connector to a wire. Positive (pin1) and negative (pin 5). It tested fine showing power through the connector. Question(s): If I attach a rechargeable AAA battery to a USB port, what'll happen? Do I need to put some sort of charging gateway between the battery and the USB wire? I can take pics if that helps!