The insides of one of those microphone looking things inside a disposable vape. It's a pressure sensor, and the chip is called S085. According to this link, it does have charging capability, Vape batteries and 18650 cells discussion How Vape Pens Work for Cannabis Concentrates The Ultimate Guide: How to Know When Vape Pen Is Fully Charged Headshop.com
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hwo does battery sensor work in one tank vape Power Up: The Complete Guide to Vape Batteries – eJuiceDB