At the risk of sounding like a salesman.... I recently bought a charger (includes solar) from Revolve Electronics for my iPhone that also works really well for my Kindle . Now, I don't have to organize my life around a dying battery because I can recharge anytime with the xeMini from AC, solar, the car, or even its internal backup battery . Chargers from other companies like Solio are fine I'm sure, but none of them do everything my xeMini does. I can even charge both my iPhone and Kindle at the same time!
I have been sooo happy and impressed with this product, I can't resist telling people about it. Really, you gotta check it out...
www.revolveusa.com