I've been salvaging these disposable vapes for the 3.7v 500mAh lithium batteries inside. They can be used to power small electronic projects with the appropriate charging circuit and voltage converter. : r diyelectronics Cartisan Micro Small 510 Battery Discount Vape Pen 510 Vape Pen & Cartridge Batteries 510 Vape Pen & Cartridge Batteries
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