In short, MegSafe's light turns to green when the rMBP is not fully charged. It will continue charging, but stop when it's nearly full. Let's say the Max capacity stated by System Info is 6530 mAh. MegSafe would turn green at like 6300 mAh and continue to charge until like 6480 mAh (still not fully charged). Throughout this whole period, the battery indicator would indicate that the battery is 100% charged. And then if the rMBP is turned off, and restarted, System Info would suddenly indicate that the charge remaining has become 6530 mAh, and that the machine is fully charged. There's a thread on a problem similar to this a year ago about the MBA: http://forums.macrumors.com/showthread.php?t=1429790 I wonder if anyone with a new Haswell rMBP also has the same problem here? I know there's a page here dedicated to battery - I've read it - but it doesn't seem to address this particular question.