Apple MacBook (13-inch, Early 2008, Late 2008) - Manual (Page 33)

Chapter 3 Boost Your Memory 33
Installing Additional Memory
Installing memory involves removing and replacing the battery. The following
procedure includes instructions for removing the battery, adding memory, and
replacing the battery.
Step 1: Remove the battery.
1 Shut down your MacBook. Disconnect the power adapter, Ethernet cable, and any
other cords connected to the MacBook to prevent damaging the computer.
WARNING: Use care when handling the battery. See the battery safety information
on page 58.