The charging bank has been charging for a long time or only one light is flashing, the reasons are as follows:
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1, the battery capacity is large; With a sufficient 10000mah mobile power supply, it takes about 11 hours to charge with 1A. Four power lights may not be able to average the indicated power, it is possible that the first light point 5 hours.
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That should be your charger has a problem, can change a charger to try, or the same grid, that is the charging treasure battery damaged