The backup battery is a perfect solution for re-charging your ipod/iphone no matter where you are. Simply charge the battery 2-4 hours before your mission and carry it on to the depths of your travels. When your iphone/ipod becomes low on its life supply, plug the backup battery into your USB port, get it charged and get extreme. It doesn't get any simpler to then charge-execute-success, with this 1900mAh Lithium-polymer backup battery. Charging the battery is simple, there is a port for charging at the base so you can use the charger or usb cable that came with your device.
Specifications:
Power charger for iPhone 4th / 4G
Capacity: 1900 mAh
Input: 5.5V +/- 0.5V, 500MA
Output: 5.0V +/- 0.5V
Color: White
Approved: CE / FCC