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Yes, they do work. I bought my adult son a solar battery charger for Christmas several years back. I also bought him a solar radio that came with a phone charger in, but it wasn't the correct type for his brand of cell phone. I guess all cell phones have different adapters, so find out the brand of cell phone before hand. The C.Crain Company has quite a selection of Solar Chargers & other "survival" type goodies like LED flashlights & such. There's nothing like a great flashlight that's easy on batteries when the power is out. My favorite thing in a power outage is a LED flashlight that fits on your forehead with an elastic band. I found one at my local hardware store & wouldn't be without it in an emergency! There's nothing like having both of your hands free when you're using it!
http://www.ccrane.com/
* Also, RV stores are great places to shop for 12 volt things that run on car or small motorcycle batteries. You can then hook the battery up to a solar trickle-charger, so whenever the sun's out, the battery is being recharged. Just stay away for those wind-up & shake-charged flashlights. At least they didn't work well for me. Maybe they've improved them in the last few years?
SOLAR BATTERY CHARGERS:
http://www.siliconsolar.com/visual-directory/solar-battery-chargers.html
Here's one for $49 that plugs into a cigarette lighter & will trickle charge any 12 volt battery:
http://www.siliconsolar.com/12v-solar-battery-maintainer-5_5w-p-16678.html
HOW TO BUILD A SOLAR PANEL SYSTEM: (--->This is GREAT info!)
http://www.ehow.com/how_4435110_build-portable-solar-panel-system.html
You can go to Walmart to the auto department and get and invertor and connect to your car battery. Can charge cell phone, run small fans, small lamps, ect.