What Causes Abnormal Noise from the Battery During Charging?

1 Answers
StDerek
07/30/25 8:23am
Here are the specific reasons for abnormal noise from the battery during charging: 1. Dust and lack of lubrication: The battery charger has a fan for heat dissipation. Over time, dust may accumulate on the fan or the fan roller may lack lubrication, leading to loud noises. In this case, adding lubricant to the fan roller can resolve the issue. 2. Loose magnetic core: The high-frequency magnetic core inside the charger may become loose. It can be secured with a piece of paper and then sealed with paraffin or hot melt adhesive. 3. Failed filter capacitor: The failure of the front-stage filter capacitor increases ripple, usually accompanied by a decrease in charging current. In most cases, this can be identified visually—the top of the capacitor may bulge slightly, or there may be electrolyte leakage at the bottom, leaving brown-black marks, or green/white powder on the pins. If this is the case, replacing it with a new capacitor of the same model will solve the problem.
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