Fast charging batteries lose their health quickly and consume power quickly.
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The charging voltage and current of fast charging are larger than that of slow charging, so to the extent of damage to the battery, fast charging must be more damaging to the battery.
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This is also a big reason why Apple has been limiting the charging power.
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Apple mobile phone in the battery health interface, there is an optimized battery charging function, the function is to delay charging to more than 80% can slow down the aging of the battery, so it is still good to slow charge, fast charge will accelerate the aging of the battery.
The IPhone is usually a fast charge than a slow charge on the battery, then the mobile phone charging process generally use the recommended slow charge for charging, but the charging speed may be slow, in the charging as far as possible to choose slow charge for use can effectively improve the battery life