Credit: The Gadgeteer
Apple laptops have a magnetic connector for their charging cable, called MagSafe. Idea is that if the charge cable is kicked, the connector will disconnect & the laptop won't be damaged by a fall to the floor.
But relief is at hand for those MacBook owners who don't understand that a fall to the floor is not compatible with continued operation of their computer: MagStay Power Connection Lock.
Problem solved?
http://the-gadgeteer.com/2013/05/13/keep-the-power-cord-connected-to-your-mac-laptop-with-the-magstay-ms-01/ / charge recharge connect connector battery /