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RTC battery
NOTE: Removing the RTC battery and leaving it uninstalled for 5 or more minutes causes all
passwords and CMOS settings to be cleared.
Description Spare part number
RTC battery 449137-001
Before removing the RTC battery, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is off 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 first 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 39).
5. Remove the following components:
a. Hard drive (see
Hard drive on page 40)
b. Optical drive (see
Optical drive on page 46)
c. Keyboard (see
Keyboard on page 50)
d. Switch cover (see
Switch cover on page 48)
e. Speaker (see
Speaker on page 53)
f. Display lid switch module (see
Display lid switch module on page 54)
g. Display assembly (see
Display assembly on page 55)
h. Top cover (see
Top cover on page 60)
i. System board (see
System board on page 66)
Remove the RTC battery:
1. Turn the system board upside down, with the audio connectors toward you.
78 Chapter 4 Removal and replacement procedures