My answer is this
1.Redmi bracelet charging head broken only need to buy a new, it is OK.
2. Because the charging head of the red rice bracelet is disposable, the charging head can not be repaired, if the charging head is broken, then do not use it anymore, because there may be danger in the process of use, we only need to buy a new one on the official website.
You can buy a new charging head online