Confirm me if this could work?

I found an article on the web and was wondering if this can be done?
Is there any chances of damaging the battery of my iPhone?

http://techagram.com/bike-phone-charger/

It will work if you do it right. That's just a little 12 volt generator bikes have used for 50 years. It's easy to build a little rectifier, regulator to get clean 5 volts DC if you know how. If you don't know how and try anyway, it would be easy to wreck the phone.

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