You can purchase solar charged batteries and a solar charger from a variety of companies, but here is one example (http://www.siliconsolar.com/travel-solar-battery-chargers.html). And here is company that offers solar USB rechargers (http://www.lightinthebox.com/producttags/Solar-Powered-Usb-Charger/).
If you are really motivated, you could even build your own solar USB recharger. http://www.wonderhowto.com/how-to-build-solar-powered-usb-charger-78846/
As far as solar battery chargers go, it seems like they aren’t very well-reviewed. They simply aren’t able to get enough power from the sunlight to charge a set of batteries, and many designs wind up heating the batteries in the sunlight (which shortens the lifespan of the battery considerably!) However, this charger seems to have pretty good reviews.
Now, for a solar USB charger, here’s an instructable to make one yourself. There are also many other solar USB chargers that come with many adapters available on Amazon, where you can check ratings and reviews to comparison-shop.
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