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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 449729-001
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 43).
5. Remove the primary hard drive cover (see
Primary hard drive cover on page 45).
Remove the RTC battery:
Remove the RTC battery from the socket on the system board.
Reverse this procedure to install the RTC battery. Be sure that the RTC battery is installed with the “+”
sign facing up.
Component replacement procedures 53