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1, we can see whether the charger interface is caused by poor contact, it may be because the interface of the phone or charger enters some dust, which will cause poor contact when charging. At this time, we can use a brush or paper clips and other tools to clean up these dust, usually we should pay more attention to the cleaning of the charger interface, pay special attention to waterproof and dustproof.
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2, the charging plug or charging cable does not match the phone. Plug power is not enough, or does not match the charger line, because the support wire is different, resulting in voltage instability, mobile phone charging will become very slow, the solution is to use the original mobile phone charging plug or charging line, charging plug and charging line is to match