Use mobile power such as a charging bank to charge the phone, or buy a cigarette lighter external phone charger to charge the phone. The reason for the slow charging is that the USB interface of the vehicle itself is to provide data transmission between the vehicle and the phone, rather than the charging design.
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USB interface precautions:
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1, it must be charged when the car engine starts, to avoid the instability of the vehicle power supply, resulting in the phenomenon of the electric device burning out.
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2, must not supply too many electrical appliances, causing too much load damage to the car battery and generator.
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3, can not be used in thunder, to avoid lightning accidents.
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4, do not use the USB interface in a humid environment, if there is rust, water stains will cause the USB disk can not be connected normally.