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Super usb Charger?

Im planning on building myself a portable rechargeable large capacity (Ah not mAh) usb charger. Im a bit of a electrical newb but I am a mechanical engineer in training, If someone could point me in the right direction or at a good instructable that would be awesome

Re-design6 years ago
Take a 12 volt 7ah battery and wire a 7905 voltage regulator to that per the data sheet. Connect the 5 volt output to a usb socket per this pinout and you have your super usb charger.

I won't guarantee that you won't destroy some of the things you're trying to charge since some things actually converse with the data port and tell the computer how much power it needs.
Douglerful (author)  Re-design6 years ago
Thats what im worried about, frying my ipod lol