Dexim DCA171SP 3000mAh Back-Up Battery for iPhone 4/4S/3GS/3G/iPod Touch/Nano (Black) 3000mAh Lithium Polymer Battery Compatible with iPad/iPhone 4S/iPhone 4/iPhone 3GS/iPhone 3G/iPhone and All iPod models except Shuffle Compatible with Micro USB Smartphones as Samsung, HTC, BlackBerry, Nokia and More