If it is a newly bought product, the Apple charging bank is not charged to a large extent to consider the problem of the charger. For example, the external output current of the charging head is too small, you can try to connect the computer to charge, or you can use a larger current 5-hole maximum 2.4A current Jaguar to charge the M5 charging head. Some charging head after a long time of use, there will be part of the failure to charge, it is recommended to replace the charging head to try.
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(2) Change a charging cable to see. When we buy a charging bank, we will be equipped with a charging cable. When we find that the product cannot be charged, we should first check whether the charging cable is broken. The easiest way is to compare the data cable with the mobile phone. However, the probability of this happening is not so large that it can not be used as a first choice, but it should be taken into account.
It may be a problem with the data cable, try using the original charging cable of the phone, usually the phone will automatically reduce the charging current when it is fast full, and the original data cable may not be supported