Technically speaking, fast charging has been popular for several years and is now very mature. Many mobile phones have the application of fast charge technology, and the reliability has been fully verified. Fast charging will have no effect on a battery that meets the design requirements. The development of batteries is originally toward higher energy density, stronger charging rate, higher temperature tolerance, and higher cycle life. Fast charge technology is just to adapt to the development of battery technology.
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The original 5W charger is standard, but Apple saves costs. The previous iPhone7 began to support the iPad's 5V 2.4A charging, and the iPhone 8 later supported 18W PD fast charge.
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Battery aging is a normal phenomenon, whether you use slow charge or fast charge, the battery will age with use. Don't worry too much about the percentage of battery health. If you want to protect the battery, you can follow the \"eat small meals, but recharge\" habit to use. Simply put, the usual choice of power in the 30%-80% range of charging, each time does not have to be charged for a long time, there is a need to pull the use, will then charge it is not in the way. Do not use the automatic shutdown, when it is fully charged.
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Fast charge requires the support of the phone itself, and a mobile phone will be designed with these in mind. If it can be charged quickly, it means that the battery and charging circuit are designed to support fast charging. Not to mention the subsequent charge and discharge test under various conditions, it will be marketed.
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In addition, to trigger fast charge, the protocol needs to match the mobile phone handshake. Charging phones that do not support fast charging with a fast charging head will not trigger fast charging at all. Will be processed according to slow charge or refuse charge, will not charge the phone.
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In summary, there is no need to worry about the damage to the iPhone battery caused by the use of fast charge.
Fast charge mobile phone, slow charge has no effect on the mobile phone battery, but also will protect the battery motherboard chip, extend the life of the battery, mobile phone in the use of fast charge, will use a large current in a short period of time to charge and discharge the battery, for the battery life and efficiency will have a certain impact, if the use of slow charge, although the charging time is longer, However, it can reduce the battery shock to ensure the battery life is extended