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
Replacable Vape Batteries: What You Need to Know - Ashtray Blog
Ooze Quad Flex Temp 500mAh Vape Battery With USB Charger | Vaporizers | Midwest Distribution
Inovape Explains Vaping: Internal Battery vs External Battery - Inovape
Amazon.com: Nitecore UMS2 Intelligent USB Dual-Slot Quick Battery Charger for Li-Ion/Ni-MH/Ni-Cd/IMR 16340 14500 18650 21700 20700 AA AAA and More Batteries, with LumenTac Battery Organizer : Electronics
Ooze Vault Extract 450mAh Vape Battery With USB Charger | Vaporizers | Midwest Distribution
You Can (and Should) Recycle Batteries. Here's How. | Wirecutter