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A few days ago I changed the battery of my MBP, however after calibrating it, it keeps going off suddenly and stays totally dead until I connect it to the power adapte. Can anyone give me some help?

First try to reset SMC (system management controller). SMC is responsible for the energy management of your mac. If it is not help, probably your battery is faulty. Here you can find info how to reset SMC: http://osxdaily.com/2010/03/24/when-and-