It is caused by the aging of mobile phone batteries and the aging of components. The mobile phone battery has been aging since the beginning of use, the process of increasing internal resistance, slow charging, and capacity decline is irreversible, the aging of mobile phone components will increase the power consumption, and some mobile phones will also have leakage.
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The internal resistance of the battery increases in the case of constant voltage, the charging current becomes smaller, especially the faster it is filled, and sometimes the charging speed cannot keep up with the discharge speed, because the battery capacity is reduced by every percentage of the battery capacity, which gives the feeling that the speed of power loss will also be accelerated