Enercell Universal portable battery Pack
25http://booredatwork.com/2011/04/13/enercell-universal-portable-battery-pack/
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Enercell Universal Battery pack is a simple rechargeable charging solution, that can charge you iPod touch, iPhone or any smartphone with a micro USB charging port.
The Enercell is very easy to use,, with the attachment you can cycle charging between your iOS products and other smartphone. It also has an LED indicator letting you know how much juice you have left in the tank. It comes with a 2400 mah battery.
The Enercell battery pack can be purchased at Radio Shack for $49.99
http://www.radioshack.com/product/index.jsp?productId=10957435&retainProdsInSession=1