While battery's capacity is not improving, people are targetting on easy battery charging solution too. Roland Kleinfeld has designed and developed The Ultimate Solar Charger, a cell phone charger that uses solar power to recharge dying batteries. Charging using the free solar power is definitely a good idea but the difficult part is to supply a stable stream of power to the phone so that it won't hurt the battery. More info inside.

Kleinfeld was inspired for the solar powered cell phone charger while at a local fair on vacation in Shenzen, China. "I saw lots of garden light products and camping lights running on solar energy. At the same time, I was on my cell phone talking to an associate, when my cell phone battery died during a very important moment--don’t they always? How ridiculous in this day and age to have a cell phone battery die on you with all the technology the world possesses!"

And so the Ultimate Solar Charger was born. Kleinfeld hired a staff of technical engineers in China to perfect the technology before they even designed the look of the solar powered cell phone charger.

The Ultimate Solar Charger fully recharges a cell phone battery, and can hold the charge for up to 14 days. Users can also talk on the cell phone while it is charging.

The solar cell phone charger is compatible with most cell phones, including:

• Over 30 Nokia models
• 20 Ericsson models
• 14 Motorola/Nextel models
• 8 Seimens models