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 Disposable Vape Batteries Show Reusability and How to Use POTV Lobo Replacement Battery POTV Planet of the Vapes Understanding the 3 Main Types of Popular Vape Batteries: ICR (LiCo02 or LiCd), IMR (LiMn), and Hybrid The Vape Mall How to Safely Charge Lithium Ion Vape Batteries Wickedly Hot Vapors