1, this is because after the update, the system will be optimized for adaptation, not only slow charging, but also the possibility of shorter battery life, but users can rest assured that the use, because this situation will return to normal after two or three days of system adaptation;
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2. Because the application will continue to run in the background after updating the system, it will cause power consumption, so the power consumption while rushing will cause the illusion of slow charging;
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3, the charger or charging cable is identified by HarmonyOS as a copyleft version, not Huawei's original charging device, because this function is only available after the launch of HarmonyOS, the system will automatically monitor and remind users;
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4, it is possible to enter the intelligent charging mode, which will also cause slow charging;
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5, it may be that the temperature is too high when charging after upgrading HarmonyOS, because it will be optimized after updating the system, so the phone will run a lot of software and background, then charging while playing, it will cause too high temperature, for the sake of safety and mobile phone, battery is not damaged, it will slow down the charging speed.