Adapters Charge Cell Phones Using Standard AA Batteries (.PDF)

Editor's Note: Due to the comments at the end of this article, the author has agreed to change the circuit slightly to reflect three AA batteries in series (which agrees with the photo of the battery holder in Figure 1). This will alleviate the problem of placing batteries in parallel in the circuit. As for different chemistries, it was not the intent of the author to encourage the use of different battery chemistries in the same circuit...

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