Currently Being ModeratedDec 6, 2011 12:00 PM (in response to Pieter Kroon)
Your MBP came with a 60W adapter, and the old MB charger can only put out 45W. So it will charge the MBP's battery when the machine is shut down or sleeping, and perhaps when the computer is being used for light work, though charging will be slower then than it would be with the right adapter. When the machine is working hard, the battery won't be charged. You won't do the computer any harm, but the adapter will probably get hotter than the original adapter did, so be sure to use it only where it has air circulating freely around it for cooling.
Currently Being ModeratedDec 6, 2011 12:05 PM (in response to eww)
Well, thank you very much! I'll go to an Apple Store to get a new charger, again... if it still falls in guarantee... If not, then I'm fine with this charger, since it is working for fine for me at this moment