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This is a tutorial on how to create your own external battery charger.


Step 1: Things to Purchase

- Battery box
- 5v step up voltage regulator
- an extra cable for your cellphone

everything was bought on eBay for less than 10 $ total

Step 2: What Voltage Do You Need?

1- Find the voltage you need by looking at you cell phone wall charger sticker
2- Mine was around 5 V  so I bought a 5 V step up regulator
3- Connect the battery box to the voltage regulator using this schema http://www.sparkfun.com/datasheets/Components/LM7805.pdf

red is input , black is ground, 
the output is what you want to connect to your cell phone cable.

4- connect the cable (after cutting out the USB part )
Enjoy!

Feel free to comment is this tutorial is not clear enough.
will this worK? becouse lm7805 needs about 7.4 volts and if thats box is 4*1,5v =6 i think it wont work
<p>Sorry lol, that was back in the days where I was learning electroncs. Wow a comment after 3 years.</p><p>yeah you're right, please disregard my post. I didn't even know what a datasheet was back then. </p>
<p>This is a good place for me to start my project. I want to charge my phone directly using my motorcycle battery- only concern is battery drain but it should be easy enough cause I already got a cigarette lighter on there (thinking on my feet)so I could even probably cut that cord or tap into it drawing power to a synced USB cord right to my phone! Just got to check voltage I guess and grounding</p>

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