The Juice Pack Air by Mophie is a rechargeable external battery concealed within a protective case for the iPhone 3G and 3GS. It’s the world’s thinnest rechargeable battery case and can virtually double your battery life. The Juice Pack Air’s hard shell case also offers protection for all corners of the phone in a light-weight, low profile design. <p><br class="spacer_" /></p> Buy from Amazon: <a href="http://www.amazon.com/gp/product/B002BDU7U2ie=UTF8&tag=digitren08-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=B002BDU7U2">Mophie Juice Pack Air Case and Rechargeable Battery for iPhone 3G, 3G S (Black)</a><img src="http://www.assoc-amazon.com/e/irt=digitren08-20&l=as2&o=1&a=B002BDU7U2" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />