First, the power supply is unstable. In the process of charging, the charging cannot be steadily and continuously output due to the current output value of the charging bank.
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Second, the charging interface is polluted, especially the pollution of solids will cause the charging to slow down.
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If it is due to the instability of the power supply caused by the slow charging of the charging treasure, it is necessary to find a stable power supply, some charging treasure will design two jacks, one is a smaller MA, one is a larger MA, generally between 1A and 2A. If the input demand of the mobile phone is relatively large, it is recommended to choose 2A, which may make the charging bank charge faster.
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If there are pollutants at the mobile phone jack, then it is necessary to disinfect it with alcohol, and then find the source of the pollution, clean it up with something like a toothpick or thin wire, and then try it again at this time, and it will generally be able to charge smoothly.