Wysips demonstrated its breakthrough technology, which "layers a thin, transparent photovoltaic film on top of a phone's display." This film captures solar energy-or even energy from a nearby light source-so you don't have to hunt for an outlet by the middle of the day. Maybe not ever again.
According to Wysips:
the technology will fully charge a typical cell phone battery in 6 hours of outdoor light, but it would take longer indoors to fully juice a handset. With the second-generation technology that will arrive next year, you'll have enough juice for 30 minutes of talk after just an hour of charging. While those times seem long in comparison to typical AC or USB charging, this is all done with light and occurs seamlessly while you use the phone. Plus, the phone is always sipping energy-unless it's in a pocket or purse.
Also, there's a solar leather case for the iPhone 3G. So does the case work? Yes. It has a battery built-in which can be charged with a mini USB cable for a total of 1,500 mAh. Three hours is about all you need for the case to be fully charged and this is about enough power to charge the iPhone to about 50% capacity.
In actual operation, the charger works splendidly... It has bright blue LEDs to tell you charge level. Sadly, the manual was translated as poorly as any I've ever seen. This's really not that important though because for a $48 case it is pretty easy to use and you don't really need to be a rocket scientist to work it. Moreover you get about a 50% charge from this case when it's fully charged.