The US$54.95 Cellink I (http://usbcelldrive.com) is a portable backup battery, USB charger, micro SD card reader, and data transfer device all in one. It works with iOS devices.
Its 600 mAh rechargeable back up battery restores and extends battery life for mobile devices. For example, it can provide over 90 minutes of continuous talk time and over two days of standby time.
The Cellink I also provides USB charging capability for all mobile devices. Charging time varies based on the device’s battery capability. The Cellink I is charged simultaneously during device charging — or it can be charges separately from a computer USB port.
The Cellink I is also a data storage device using card reader that supports general micro SD/SDHC memory cards. It supports data and media transfer between a cell/smart phone and computer. You can transfer photos, videos, music and any other files supported by the mobile provider’s software.