1. Power off immediately: If the charger is exposed to rain and makes abnormal noises while charging, it should be stopped immediately and the power plug should be unplugged to prevent circuit short circuits or electric shock hazards.
2. Check and dry: Move the charger to a dry and ventilated place and carefully check for water infiltration inside. If there is water on the shell, it can be gently wiped clean with a dry cloth; If there is a possibility of water ingress inside, it is recommended to remove the outer shell and dry it with a hair dryer's cold air mode, or use a desiccant to accelerate dehumidification.
3. Testing and replacement: After confirming that the charger is completely dry, try reconnecting the power supply but do not connect the battery first, and observe if there are still any abnormal sounds. If the sound disappears and works normally, it can continue to be used; If there are still abnormalities or concerns about internal damage, it is recommended to replace the charger with a new one to ensure charging safety and battery life.