Can anyone recomend a good solar powered external battery for apple devices?

[TheMkrage]

Ok I am constantly on the go and I always have my iPod, iPad, and iPhone on me and am constantly using them. Everyday, one seems to run out when I need it. I was wondering if anyone could recommend am external battery that can be used solar powered or from an outlet that will charge my devices on a daily bases. Also not too heavy because I need to be able to carry it around as if its an iPad. Also if it had dual USB ports that would be nice too and not too expensive if possible. (Less than 50 dollars) thanks

[Bob]

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http://www.apple.com/iphone/built-in-app...phone.html
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CompTIA A+ Certified Computer Professional