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1. Bad, harmful
2. Because the quality and safety of Apple's three-way fast charger cannot be guaranteed, there may be problems such as excessive current and unstable voltage, which may lead to safety risks such as overheating of mobile phone batteries and fast charging speed.
3. In addition, the use of three-party fast charger may violate Apple's official regulations, which may cause the phone to malfunction and even affect the normal use of the phone.
Therefore, it is recommended to use an official certified charger to ensure the safety and stability of charging.