Regarding the super slow charging of mobile phones in the car, the reason is that the car charger itself has a small current, and it may also be the quality of the charging line is not good. For this, you can increase the voltage of the car, the voltage is high, the charge will be faster. Secondly, you can also carry a charging bank with you, which is much more convenient than charging in the car. Warm reminder: Mobile phone charging is best to use direct current, the loss of mobile phone is relatively small, but also to prevent the occurrence of safety accidents such as mobile phone explosion
The car current is unstable and does not support fast charging.