1. The general battery may have been broken, charging 20 minutes still can not be used, you should change the battery;
2. If the Mi Wristband cannot be charged, you can perform the following operations: remove the body of the wristband from the wristband and scrape the charging contact with a hard object; Also clean the charger contacts; Insert and remove several times and press firmly; If the bracelet is not charged for a long time, charge it for about half an hour to see if it can be normal;
3. If it is still unable to charge, please contact the after-sales service to find a professional to help solve it.