my anker 20100 started lighting up randomly with nothing plugged into it, should i be worried
Is it fully charged? Was the button pressed? When you say lighting up randomly, what is lighting up?
the lights on the side saying what battery it was at was lighting up randomly, it was slightly used but still at 4 bars
Does the button have a small bit of play (movement) when you run your finger over it? Try giving the button a blast with some compressed air etc as you might have some dust/dirt around the button mechanism which is replicating a button press.
Some of them light up when you plug/unplug them.