RTC battery
Description Spare part number
RTC battery 746439-001
Before removing the RTC battery, follow these steps:
1. Shut down 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 all external devices connected to the computer.
3. Disconnect the power from the computer by rst unplugging the power cord from the AC outlet and then
unplugging the AC adapter from the computer.
4. Remove the battery (see Battery on page 28).
5. Remove the optical drive (see Optical drive on page 29), if installed.
6. Remove the bottom cover (see Bottom cover on page 35).
7. Remove the system board (see System board on page 53).
To remove the RTC battery:
1. Position the system board upside down.
2. Using a thin tool, disengage the battery from the socket (1), and then remove the battery (2).
Reverse this procedure to install the RTC battery.
Component replacement procedures 55
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