The reason may be the poor contact of the charging bank interface or the problem of the data cable. Try to reinsert the interface and replace the data cable connection;
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2, it may be that the power of the charging bank is insufficient, try to recharge the charging bank before use;
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3. It may be that the power management chip of the charging bank is burned or the battery core is damaged, and the corresponding parts need to be returned to the factory for maintenance and replacement. Hope to help you!
If you use the same Apple Lightning data cable, you can charge with a charging bank, but you can't charge with a charging head, it should be that the charging head is broken and can't be charged.