Inside a burned out Aukey power bank.

Although Aukey seems to have a reputation of being a good brand (note the Sony cells), any brand can suffer a failure. The owner of this pack was woken by a burning smell in the middle of the night and found his charging power bank getting a bit hot and flustered. He immediately put it outside in a safe place.
It looks like the simple 5V USB output circuitry has failed with the chip possibly going short circuit and jamming the output inductor on. Note the piece of foam tape that presses against the top of the driver chip in the video's thumbnail. That doesn't seem like a good idea unless it's some sort of thermally conductive foam.
While it was interesting to see the fault, there's not much to say as the chip has been toasted beyond identification.
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