The Week in iOS Accessories: Power and light
The $80 PoP’n isn’t exactly a battery case for your iPhone—it’s more a battery that attaches to your existing case or bare phone, adding up to 70 percent more talk time than you’d get out of your phone’s own battery. The PoP’n is lightweight and offers what PowerSkin says is a “comfortable grip” made especially for extended gaming use.
http://www.macworld.com/article/2028618/the-week-in-ios-accessories-power-and-light.html
