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I am really looking into a way to be able to charge AA batteries and other electronics through a standard car charger outlet while out on the trail. I have began researching several foldable items that can be strapped to the backpack. Was wondering if anyone had advice or experience with a good one?
 

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This one,...

http://www.powerfilmsolar.com/foldable-solar-chargers/usb-aa.php

Works very well. With a set of (8) eneloops you are pretty much ready. It charges the batteries fairly quickly and then you charge USB devices off of the battery charge. It it possible to have 2 batteries charged up for say a light and then charge another 2 to refresh a USB device daily.

It folds up very small, is pretty weather proof and gets the job done.

This is for my BoB though. If I were going to camp or sit out for a while then I would choose one of their larger models. Even those are very compact.

This is the biggest one outside of their military style ones, http://www.powerfilmsolar.com/foldable-solar-chargers/f15-3600.php

Now,... it is $1,000 but it does fold down to the size of a hard back book and puts out enough juice to directly run a lot of things.

Between these 2 there are a few other models ranging in price, performance and size. I am sure one will fit what you need.

Out of the solar solutions I looked at the first one I listed was the winner and I am liking their thought process/product line in general.
 

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I am really looking into a way to be able to charge AA batteries and other electronics through a standard car charger outlet while out on the trail. I have began researching several foldable items that can be strapped to the backpack. Was wondering if anyone had advice or experience with a good one?
This one works awesome. Tried and true.

http://www.cascadegps.com/store/sunlinq-12-watt-folding-solar-panel.html

I advise you to purchase the Tekkeon 3450 MyPowerAll battery with this. Unlimited charging capability for your 12-volt needs.
 

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There are several sights that sell DIY kits for battery charging. The cells and other parts aren't expensive. What costs so much money is a name brand, complete unit, like Brunton. I often thought about buying the parts and building a flexible, folding charge unit and selling them to friends! Maybe sew one into a tarp shelter. Now I just try to stay away from battery powered devices!
 

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I am seeing brand names I know nothing about for many of the solar style chargers online. My situation is that we need to charge AA batteries when we are camping, and we also want to keep a charge in the cell phone or notebook computer if we would need to use it. I just buy a AA solar charger at http://www.buyerisland.net/solar charger.htm and it is the Bee's Knee's... I will get a few more as it is just so darn simple and small. We use daily at home now. I would like to know if anyone would have some expert knowledge of the SL-Series foldable solar charger on the same site. It looks like it will charge all the devices we would want... Your feedback would be fantastic ! Thanks in advance.
 

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Here is a cheap way. I bought one of these for less than $40. Hand crank, solar, battery, AC with SW/FM/AM/NOAA. Solar will charges AA for use somewhere else and the crank will charge batteries. Granted , you may to crank for a half hour to get a charge but look at the price!

Also. The single Outside solar lights at Walmart cost $5, they each have rechargable AA in them already and act as a light too. B buy 4 or 5 and you can charge their rechargable batteries for use anywhere in any device. Oh, the hand crank will also charge a Cell Phone and comes with adapters for most phones An added bonus I discovered is with a USB universal adapter kit, it will charge ANY usb device. So for under $70, you get 4 solar battery chargers/Lights PLUS an AM/FM/SW/NOAA/TV solar/hand crank/battery/AC/cell phone charger survival radio. Can't beat that with a stick.

http://www.solarcellshop.info/detail/kaito-ka009r-4-way-powered-emergency-crank-radio-B000UK388Q
 

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The one I mentioned has supposedly a 60day purchase window and then would only be available in bulk.
# Output (V): USB (5V), 3V, 6V, 9V, 12V, 16V, 19V, 22V, 24V
# Output (A): 1A (USB 5V), 1A(3V, 6V), 3A (9V, 12V), 4A (16V, 19V, 22V, 24V)
Recharge battery through included wall AC adapter, car cigarette power adapter, or solar energy.
Solar Charging Power (per hour): 2,500 mAh (MAX)
Battery Capacity: 3.7V 20,000 mAh (74W/h)
 
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