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Can I use AA instead of 18650?

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About 18650 Batteries

Panasonic, Sanyo, Samsung, and LG are the top level 18650 cell manufacturers, making long lasting cells in a standard size (18 mm by 65 mm) that fits all 18650 compatible devices. Chinese knockoffs are available for cheaper, but are prone to shorter lifespans and aren't always uniform size.

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