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Subscribe for more videos (every Wednesday and surprise specials): http://goo.gl/QjZqko I recently made a video proving that it was possible to charge a cell phone with a 9v battery. For this to be viable the charger should be efficient and able to work with low voltage. In this video I test some 12v chargers and dc-dc modules. Did you like it? Thumbs up! Did you not like it? Comment so we can improve! Do you want to see more? Subscribe, it's free :) Do you think it can be useful to someone else? Share the video. Regards.