Some hardware hackers have reverse engineered the Apple's product iPhone and tried to find out the secret of its charging capacity. If you have observed iPhone gets a quick charge when compared to other smartphones, I my self had observed it(quick charging). These hackers had made a pretty awesome research giving out the solution for charing the iPhone using a AAA or AA batteries, they prepared a handy circuit using some pullup resisters to maintain the charge flow from the batteries and made it possible.
You can watch in the VIDEO for more information how did they manage to do it.
Read the complete story HERE.