There may be several reasons why a mobile phone cannot be charged fast but can be charged slowly:
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1. Charger and data cable problems: Make sure that the charger and data cable you use are genuine and compatible with your phone. Poor quality or damaged chargers and data cables may prevent your phone from being able to charge fast.
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2. System or software issues: The phone's operating system or application may have a software issue that prevents the phone from charging fast. Try to update your phone's operating system and apps to the latest version to fix potential software issues.
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3. Battery aging: Over time, mobile phone batteries will gradually age. Aging batteries may not be able to support fast charging. In this case, replacing the battery with a new one may solve the problem.
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4. Mobile phone hardware failure: the charging circuit or power management chip of the mobile phone may be faulty, resulting in the mobile phone cannot be fast charged. In this case, it is recommended to contact the phone manufacturer's customer support or go to an authorized repair center for further diagnosis and repair.
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5. Charging environment: Low temperature environment may cause the phone to be unable to fast charge. To solve this problem, place the phone in a suitable temperature environment to charge.
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Try the above solution to solve the problem that the phone cannot be charged fast but can be charged slowly. If the problem persists, it is recommended to contact the phone manufacturer's customer support or go to an authorized repair center for further diagnosis and repair.