IvySkin USA (http://www.ivyskin.com) has released a line of protective cases for the iPhone 4. The all new Quattro 4 (shown) cases as well as the SmartCase feature interchangeable battery pack and patented Touch-Thru glass Multi-Touch screen.

The US$44.95 Quattro 4 comes with a Glass Touch-Thru scratch free screen in addtiion to the polycarbonate shell that snaps on the back of the iPhone. It’s available in four colors.

The $79.95 SmartCase 4 retails for $79.99 USD and comes with Quattro 4 case along with a 1500mAh battery pack and Glass Touch-Thru screen. It is now available for pre-order in four colors.