18650 batteries as an on the go charger for iPhone

Dear All,
I just ordered this bike light :
http://www.ebay.co.uk/itm/110992304085?_trksid=p5197.c0.m619#ht_7119wt_1124
As it has a big battery I want to add another function to it which is charging my iphone on the go.As you will read it has 4x 18650 Battery which makes the output equal to 4x3.9=15.6 volt.
What is the best option to bring the voltage in the range of 5 volt to make it appropriate for iphone charge?
Any notion on the current?
Have you got any idea?
Thanks

Hi there, I know it's been a year since your post, but did you still require help with your charger, as I had great fun making simple iphone chargers over the last couple of years.
Simon.

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