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Convenient device. For what it's worth, 18650 is a rechargeable Lithium battery type, nominally 3.6V. The number indicates the physical size, 18mm x 650mm. As a comparison, AA's are 14mm x 500mm. 18650's are physically much large than AA batteries, so I'm guessing that the description must be a mistake if you can fit AA's into it.
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