Apple MacBook (13-inch, Early 2009) - Manual (Page 39)

Chapter 3 Boost Your Memory 39
Step 3: Replace the battery.
1 Place the right side of the battery into the battery compartment. Gently press the left
side of the battery down. Use a coin to turn the latch a quarter turn counterclockwise
to lock the battery into place.
2 Reconnect the power adapter and any other cables that were attached.
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