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 Mini Tank Vaporizer Discreet 510 Thread Battery Rokin Vapes Clearly Spin 2 Battery JKD Brands GRAV Micro Pen Cartridge Vape Battery 420 Science Mini Vape Battery with Screen BOOST!
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