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.
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operating principle
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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.
It's normal. In the case of charging, the red light flashes, indicating that the current charge is being charged, that is, the power has been connected. When it's fully charged, it turns green, so no need to worry.