On Thu, Nov 11, 2010 at 4:54 PM, V G <x.solarwind.x@gmail.com> wrote:
>
> I'm looking to build a simple battery-powered charger for my mobile
> phone. I'm out a lot where it's not convienient to plug my phone into
> a wall outlet.
>
> The charger will simply consist of a power supply that provides 5
> volts via a USB socket.

The Mintyboost supports the iPhone 4:
http://www.ladyada.net/make/mintyboost/

Your homebrew device may not enable charging your phone:
http://www.ladyada.net/make/mintyboost/icharge.html
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