There may be the following reasons: 1, the voltage is unstable during charging, and the protection mechanism of the charging device causes the charging to fail;
2, the parameters of the car charger do not meet the charging requirements of the charging equipment;
3. Poor contact between the charger and the charging device;
4. The power supply of the cigarette lighter itself is abnormal;
5, the quality of the charging equipment itself has problems.
I hope my answer can be helpful to you!