18650 vs. 21700 vs. 20700 Batteries: What's Best for Your Vape Mod?
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Samsung 40T 21700 4000mAh 30A Battery
Is this genuine? This Samsung 21700 40t was bought on eBay. Not sure if it's real and it's marked with 'Not for vape' on it. If it's genuine, is it safe to
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21700 Battery 5000mAh Button Top PROTECTED Li-ion Rechargeable - Orbtronic