Difference between charging icons - does it mean anything? Sometimes I see this:





instead of this:





is there a difference? do they mean different things? One is filled in dark, the other is more transparent - the battery/charge icon..
Empty battery icon with lightning bolt means the device is plugged-in and using power but the battery is not charging.  Your Mac is using power directly from the cord.





Full battery icon with lightning bolt means the device is plugged-in and the battery is charging.  Your Mac can use power from both the cord and battery.