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PowerBook G4 (15-inch FW 800_1.5/1.33GHz) Take Apart - 49
Backup Battery
4. Press where shown to secure the backup battery to the optical drive.
5. Reassemble the computer.
6. Testing the computer should include plugging in the power adapter and letting the
backup battery charge for half an hour. Then power on the computer and disconnect
the power adapter, set the system clock, put the computer to sleep, remove the main
battery for five seconds and reinstall. The date and time should not reset.
Also, insert an optical disc to verify that the optical drive functions properly.