Hi, today I'm going to show you a very simple and safe way to build a battery powered phone charger!
Disclaimer: I am not responsible for anything you do resulting from this instructable.
First things first!
1: a 4AA battery holder purchased at radio shack. I recommend one with an on/off switch since they're the same price
(You can use a 9v battery with a 9v battery clip it's just personal preference and rechargeable AA are cheaper)
2: a Zener diode purchased in a pack of 2 from radio shack
3: last but not least a female USB cord or a male that you change to a female using this instructable http://m.instructables.com/id/Make-a-USB-Female-connector-out-of-a-USB-Male-conn/
Soldering iron (optional)
Steps: these are short and fairly straightforward.
Go ahead and put batteries in (rechargeable works best)
1 bend the Zener diode so the silver ends form a "u" and a right angle with the middle thing
2 attach the red wire of the battery pack to the end of the diode with the black stripe ( and yes it's opposite colors I know)
3 attach the black wire from the battery pack to the opposite side
4 strip all four wires of the female USB chord
5 twist or solder the white and green wires together.
6 attach the red wire to the side of the diode with the black stripe closer to the end then the other red wire
7 attach the black wire to the other side also closer to the end than the other black wire
P.s. when I say attach you can either solder or twist
Tape female USB to battery pack for easier carry and enjoy your charger!!!!!