RTC battery
Description Spare part number
RTC battery 819504-001
Before removing the RTC battery, follow these steps:
1. Turn o the computer. If you are unsure whether the computer is o or in Hibernation, turn the
computer on, and then shut it down through the operating system.
2. Disconnect the power from the computer by unplugging the power cord from the computer.
3. Disconnect all external devices from the computer.
4. Remove the bottom cover (see Bottom cover on page 35).
5. Remove the battery (see Battery on page 54).
6. Remove the hard drive (see Hard drive on page 55).
7. Remove the system board (see System board on page 66).
Remove the RTC battery:
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Disconnect the disc cell RTC battery cable from the system board, and then remove the battery.
Reverse this procedure to install the RTC battery.
Component replacement procedures 69
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