There are three possible reasons for the slow charging of the k40S.
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Reason 1: The slow charging of the mobile phone may be the data cable or charging head damage, it is recommended to replace the fast charger.
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Reason 2: There may be a problem with the mobile phone system leading to the fast charging protocol is not started, it is recommended to update the system or go to the millet home to continue after-sales maintenance.
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Reason 3: The mobile phone will generate a certain amount of heat when charging or running applications in the background. If the mobile phone continues to run applications in the background while charging, the high temperature will affect the charging speed of the mobile phone. It is recommended to close the application running in the background of the mobile phone before continuing to charge.