HT2346: Intel-Based Apple notebooks: Identifying the right power adapter and power cordLearn about Intel-Based Apple notebooks: Identifying the right power adapter and power cord
Currently Being ModeratedJun 15, 2012 5:51 PM (in response to Michael King)
There will not be enough power to run the MB, but if the MB is shutdown and then the charger attached it may charge though very slowly. Most advice is you can use a more powerful charger but not less powerful. If you don't see any increase in battery charge then it is not charging.
Currently Being ModeratedJun 16, 2012 11:14 PM (in response to Michael King)
For those interested, after 24 hours of experimentation with this situation...
Ralph's answer isn't entirely correct - the 45W adapter does provide enough power to run the computer, although I suspect the computer might be running at a reduced performance level. Email and web browsing were tested most, and some graphics intensive video & one game.
If left in Sleep mode, the battery does charge, but very, very, very slowly. I have not seen any undesirable effects of this, other than the above. Seems to be okay for an emergency like I have, but doens't seem to be okay for a longer term.