How to check charging status

How do I check whether the unit is fully charged on the Anker PowerCore 10000 Redux? When I press the button, I see all the lights light up briefly, but I can’t tell whether that means the device is fully charged.

1 Like if you press the button on the PowerCore the circle of LED lights will briefly show you the level of charge, complete ring would be 100%, 3/4 would be 75% etc