this with charge a usb Except iOS devices by a 9v battery
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Step 1: Parts Required
Female Usb port
Step 2: Clip to Diode
Solder the 9v clip positive wire to the diode
Step 3: Diode to Switch
Solder the diode to the switch
Step 4: The 5v Regulator
solder the other end of the switch to the first wire of the 5v regulator and solder the middle wire of the 5v regulator to the negative end of the 9v clip.
Step 5: The Usb Port
connect the positive end of the usb port to the 5 volts (third wire of the regulator) and the negative end to the negative end to the battery.
Step 6: Finish
Put it into a mini Altoids tin and cut holes for the switch and Usb port