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18650 vs. 21700 vs. 20700 Batteries: What's Best for Your Vape Mod?
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Amazon.com: Battery Pouch Case for 4 x 18650, 20700 or 21700 Battery, Belt Holster for 18650 Battery with Carabiner, Zipper Pocket Memory Card Storage : Sports & Outdoors
20700/21700 Battery Carrying Case 2x Clear
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