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There are several possible causes and solutions
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1. There are many background software, which consumes electricity.
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Solution: Turn off background or empty data before charging)
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2 Play while rushing.
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Solution: Power off and charge
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3 Data cable, transformer is not original.
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Solution: See whether the data cable is original, the charging head is 2a or 0.5a
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4 You are in performance mode.
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Workaround: Switch to Normal mode in system Settings
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5 The voltage is unstable. Solution: Find another outlet to use
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6 The temperature is very low. Solution: The charging efficiency of conventional batteries will be low at low temperatures, such as outdoor in winter, you can cover the fuselage to room temperature
Xiaomi mobile phone charging slow may be the use of mobile phones when charging, it is recommended to close the video, games and other high-power applications when charging. If the method does not work, there may be a problem with the phone hardware, and you need to go to the maintenance point to check.