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
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EBL 8 Pack AA 3000mAh Lithium Batteries, 1.5V Disposable Lithium Batteries-Long Lasting, Constant Volt, High Power, Light Weight, AA Batteries(Non- Rechargeable) : Amazon.ca: Health & Personal Care
Duracell DL1/3NBPK - McKesson Medical-Surgical
1500 Mah Disposable Lithium Ion Battery Nominal Voltage: 3 Volt (V) at Best Price in Chennai | Svc Infotech