Schematic at http://www.robots-everywhere.com/re_wiki/index.php?title=Ersatz_battery_booster
Sometimes you need to make sure you can livestream an event, but have little prep time. Phones usually eat up batteries like crazy then. So here's how to improvise an extender that uses AA, C or D batteries. Best of all -- no soldering, you can build it directly inside a radio shack!
Warning: Pay attention to the polarity!
http://www.youtube.com/watch?feature=player_embedded&v=RVUbIMncjqM
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