Backup battery verification – Apple Mac PowerBook 550c User Manual
Page 171
Additional Procedures
Backup Battery Verification - 4
Backup Battery Verification
The backup battery saves the PRAM and power management
information on the logic board when the computer is shut
down. To check that the backup battery is working, follow
the procedures below.
1 Set the date and time.
2 Perform a Shut Down from the Apple Menu or Special
menu.
3 Remove the main battery and disconnect the power
adaptor for 10 minutes.
4 Connect the power adaptor, insert the battery, and power
on the computer.
5 If the date and time were lost, the backup battery may be
dead or discharged.
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