https://blog.wongcw.com/2018/12/30/%e4%b8%89%e6%98%9fgalaxy-a50%e5%86%8d%e6%9b%9d%e6%96%b0%e6%96%994000mah%e9%9b%bb%e6%b1%a0-2400%e8%90%ac%e6%94%9d%e5%83%8f%e9%a0%ad/