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If we look at this from a purely theoretical point of view, the device used for fast charging brings more current and higher voltage, which makes the battery receive more energy d...

Mobile phone fast charge and slow charge which damage battery?

If we look at this from a purely theoretical point of view, the device used for fast charging brings more current and higher voltage, which makes the battery receive more energy density and charge faster. This is undoubtedly more harmful to the battery than normal charging. But the degree of harm is so small that we hardly feel the difference between the two in the process of use.