How to Build a USB Smartphone Charger Circuit Using AA Eneloop Pro Batteries?

Hi,
I am new this forum and a software engineer by profession. But I have immense interest in electronics. I am an amateur photographer too. So being in Photography I have learnt eneloop pro batteries are best rechargeable batteries. I have around 60 eneloop Pro battery all working fine. Now I want to construct a smartphone charger which can use eneloop pro batteries (required number) and charge the smartphone efficiently using usb cable.

I need help in designing the circuit for taking the input from AA eneloop pro battery and producing output which can be used to charge my smartphone.

May I please request members to guide me in designing the circuit. Let me tell you I have only basic knowledge of Diodes,capacitor,transitors, resistance never designed any circuit earlier

Hi,

What is the specifications of the phone you would be charging? Normally, mobile phones run with 5V supply. Another question, how many volts does this eneloop batteries produce? Here is a sample of a charger I looked up at google.: http://treehouseprojects.ca/phone-charger/. The charger has a 9V supply and uses a voltage regulator.. I would not really suggest this type of charger because of some efficiency problems due to current outburst. But I would be a good start to understand how it work.