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 How to Reuse Disposable Vape Lithium Batteries : 6 Steps Instructables Not 18650 but related. Recently I've been salvaging li ions from disposable vapes. Usually they are between 2.6 and 3.3v depending on how long it's been sitting. This one was at 1v. Big Chief Duo Disposable 2G Vape: Liquid Diamonds Rechargeable 21700 Li ion Lithium Battery High Drain 20A 3.7V 5200mAh Bateria Batteries, battery For Vape E cigarette Hubats Juice Head Flex Freeze 50K $14.50 PerfectVape