There may be many reasons for fast charging to slow charging in chargers, and the possible reasons and solutions are listed below.

1. The charging circuit is unstable

One of the reasons why the charger changes from fast to slow charging is due to the unstable charging circuit. Please check if the wires connecting the charger are loose or worn. Wear of wires can lead to an increase in wire resistance, resulting in a decrease in charging efficiency.

Solution: Replace the wires and ensure that they are firmly and stably connected.

2. Charger malfunction

The second reason why fast charging becomes slow charging is due to a charger malfunction. According to the type of charger, the charging head can be replaced by swapping or the entire charger can be directly replaced.

Solution: It is recommended to use the original charger or replace it with an equivalent quality charger.

3. Full battery or power management

The third reason why fast charging becomes slow charging is due to reaching the charging termination point or power management limitations. Some devices with battery protection functions will be reminded or stopped from charging as needed. At this time, fast charging cannot be performed again.

Solution: Check if the device is fully charged or disable its power management function.

4. Voltage too high or too low

When in use, due to significant fluctuations in the mains voltage, the voltage output by the charger will also fluctuate accordingly. If the voltage is too high or too low, it may cause the charger to work abnormally and become slow charging.

Solution: Replace with a stable power supply that meets the requirements of the city's electricity standards to ensure that the charger can work properly.

In short, there are many reasons why fast charging becomes slow charging in chargers, which need to be carefully analyzed and eliminated. It is recommended to choose an original charger to avoid excessive use and voltage fluctuations during operation. If the problem still exists, please try to repair the equipment or replace the corresponding components.