Can I “swap” batteries with the MacBook Pro?
Yes. To swap batteries, it is extremely important to first put the MacBook Pro to “Sleep”, then wait for the computer to save the contents of RAM to the hard drive. While the computer is saving the contents of RAM to the hard drive the sleep light will be lit constantly and when it begins pulsating the data has been saved and it is safe to swap the batteries. For additional information, including diagrams on exactly how to remove and install the battery, please refer to “How to Remove and Install the MacBook Pro Battery” as well as “How to Swap the MacBook Pro Battery” from the Apple Support Site.