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Some observations:
A power bank is just another source of 5V (USB power). It is no different than a Wall or Car charger (assumes decent quality) The device uses 5V to set/control the charge rate of the battery, It has no sense of what is making the 5V as long as it supplies it at the needed current (some device drop to trickle mode if the source is standard 500ma computer port)
Continuing to(try and) force a charge onto a FAILED (one that won't run the device at all) battery may lead to magic smoke from the device.
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