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The current iPhone not only supports ordinary 5V1A with USB to Lighting data cable ordinary slow charge, but also supports 20\/18W with Type-C to Lighting data cable fast charge, and also supports wireless charging.
The life of lithium batteries is only strongly related to the number of charges and discharges, which is more related to your use of habits. These three charging methods can be switched at will, and will not cause much damage to the battery, if it really has such a big impact, I am afraid that all iPhone accessories must be tied to a unified line.