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Amazon.com: Protected 21700 Charger XTAR New X2 3.7V 2 Bay Universal Battery Charger Protected 20700 Fast Charger with LCD Display for 18650 14500 26650 1.2V AA AAA Battery Max 2A with AC
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Your new favorite mod uses a 20700/21700 but you still have a bunch of good 18650's? 3D printed 18650 to 20700/21700 adapter! : electronic_cigarette
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