When charging, the charger has been flashing red is normal, because this is the charging status indicator, indicating that it is charging, when fully charged, the charging status indicator will stop flashing or turn green.
operating principle
The charging indicator light of the charger only detects that the voltage is too low. When charging, the charging current is relatively large, the red light is on, the green light is turned after 10 seconds, and the voltage rises to the detection voltage and the green light is indicated. This shows that the charger itself has a circuit to detect the voltage level, as long as the original foundation is modified to meet your requirements.
1: Change the sampling resistance after the switching power supply, and increase the secondary voltage of the charger by about 1V.
2: Change the charging current sampling resistor to make it smaller, so that its voltage is lower can also play an effect
It flashes red because the battery is extremely low
You can wait for half an hour to see if it still flashes red, if it still flashes, it indicates that there is a fault in the charging bin, try to take out the headset, and then put it in again to charge, or check whether the data cable and interface are not well connected, the charger, the battery is faulty, you can detect or replace, if you do not put the headset, the battery bin still flashes red when charging, that is, the battery in the battery bin is broken