One of the major drawbacks with the iPhone 3G is its weak battery. There are many solutions available in the market that enable iPhone users to enhance the battery time of their iPhones. However there is one solution that is handier and more convenient than the others. It is the solar charging battery case from Mobile Fun. It comes with a 1500 mAh battery that can be charged by sunlight in just three hours and it can also be charged via your PC using a USB cable. You can also use it to charge other USB devices. It is available in Black and White colors for $54. For more information and to order it visit Mobilefun's website.

Specifications:

Battery capacity: 3.7V, 1,500mAh
Output voltage: 5V (maximum)
Output current: 450mA (maximum) + solar battery 100mA (maximum)
Charge voltage: solar battery 6V and USB/5V DC

Source: Gizmodo