My answer is this, Mi car charging is not required to open, as long as you plug in the cigarette lighter, it will automatically open. Such a picture goes to the trouble that we forget to open, plug in the charging line directly, you can charge the phone, the charging speed is very fast, so I think the millet car charger does not need to open, I hope my answer can help you.
It is generally in the end of the data cable, with a small screwdriver to pry open, it has a card slot on both sides, a pry out and then you can take out the inside