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 Best 510 Batteries for Carts Top Picks for Power, Portability & Flavor Pulsar 510 DL Pipe Vape Cart Battery 4 projects that use recycled disposable vape batteries LOOKAH Egg 350 mAh Mini 510 Vape Battery
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