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Do these actually work?

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They do work but the take a long time to get a full charge. I have been looking into this idea and have found some crank up devises like this, there is a devise built into a pear of shoes so as you walk you charge your phone and there are the solar power ones, they would not work for me because i spend most my time in the wood under trees.


You have to consider how long it takes for you to charge phone at the mains, you will be looking at that sort of time or longer to charge your phone with one of these devises. They are not very practical for every day use but would be an asset in an emergency providing you can get a phone reception.

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