Technical information

General / Backup Battery Verification -
4
PowerBook (FireWire)
Troubleshooting
calibrate the battery. After this calibration, the lights will
report charge levels properly.
Backup Battery Verification
The backup battery saves the PRAM and power management
information on the I/O logic board when the computer is shut
down. To check that the backup battery is working:
1. Verify backup battery is connected to the I/O logic board.
2. Set the date, time, and time zone.
3. Select Shut Down from the Apple menu or Special menu.
4. Remove the main battery and disconnect the power adapter
for 10 minutes.
5. Connect the power adapter, insert the battery, and power
on the computer.
6. If the date and time were lost, the backup battery may be
dead or discharged.
7. To recharge the backup battery, leave the computer
plugged in for 48 hours. It is OK to use it while it is
charging.
8. If the backup battery appears dead or will not charge,
replace the backup battery.