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 Small but big performance!!! Xvape V one 2.0 best selling wax vape pen 1500mah TC battery and dual quartz rods portable wax vaporizer XVAPE V ONE 2.0 wax vaporizer TOPGREEN 510 Vape Pen & Cartridge Batteries Cartisan Micro Small 510 Battery Discount Vape Pen Yocan Kodo Pro: Tiny OLED 510 Battery