1. When the charge reaches more than 80%, or close to full charge, the charging speed will also slow down, which is determined by the safety characteristics of the battery. In order to ensure the safety of your use, the current will gradually decrease when the battery is nearly full, and the charging speed will slow down until it is full.
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2. During the charging process, the temperature of the phone will change. In order to make you have a more thermal experience, when the battery temperature is above a certain value, the charging current will gradually decrease, and the charging speed will be slower until it is full.