It'll probably shut down the USB port on the Mac the MacBook is charging off of due to an overload and OS X protecting you from a fried USB port/logic board.While it may not be enough to charge while using it, it can delay the discharge or you can charge it over night. The rMB has a 39.7 Wh battery. At 5,5W it will take you just over 7 hours for a full charge.
I have a 12v car phone charger that delivers 1A or 5W and it does charge the rMB, just very slowly. At low screen brightness its enough to sustain the charge it had when i started.
Not if the recipient device wants more. Try hooking up a wired keyboard to any Mac with a wired mouse on one end and an external HDD on the other end. Within 5 minutes OS X disables the USB port the keyboard is connected to.Why would it shut down the USB port? The USB port will only provide as much power as it's designed to.
Different to how a charger works then. I will give it a try when i get home!Not if the recipient device wants more. Try hooking up a wired keyboard to any Mac with a wired mouse on one end and an external HDD on the other end. Within 5 minutes OS X disables the USB port the keyboard is connected to.
rMBP to rMB, just need the cable, however is very slow, As for the display maybe this can, equally not natively.Thanks so much! Good to know it's "possible" - was just curious. I had heard charging from another rMB was no probs but was curious about from my macbook pro as I leave my rMB next to it at night.
Another question - is it possible to use the rMB as an external monitor next to my Macbook Pro?