1. The ultimate reason for this situation is that it is not charged, although there is a charging sign, the power will still drop, because the smart phone will use power when it is turned on. This is generally the charging line is too poor, resulting in charging efficiency is not high, and even may limit the current, making the smartphone look charged, but the actual situation is that the charging speed is not fast. At this time, you can change a good data cable.
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2. The charging head has low power, which is the same as the data cable, but fortunately, the charging head now supports fast charging, which appears
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3. The data cable and charging head used are normal and original, so that is the situation used by smart phones now, the amount of power required is that the charging efficiency cannot keep up, so as long as you stop what you are doing, you can charge it.