Apple MacBook (13-inch, Aluminum, Late 2008) - Manual (Page 36)

36 Chapter 3 Boost Your MacBook
3 With the latch still in its open position, gently pull up on the battery tab to remove the
battery.
You now have access to the serial number, the hard disk drive, and other components
of your MacBook.
4 To replace the battery, make sure the latch is in its open position. Hold the battery at
an angle and slide the lipped edge of the battery below the brackets on the outside
edge of the battery bay. Gently press the battery down.