https://blog.wongcw.com/2021/10/13/18650%e9%9b%bb%e6%b1%a0%e5%b0%87%e6%88%90%e6%ad%b7%e5%8f%b2-%e7%89%b9%e6%96%af%e6%8b%89%e6%96%b0%e6%ac%bemodel-s%e9%99%aa%e5%ae%83%e9%80%80%e5%bd%b9/