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 (includes 2-sided tape) 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 47).
5. Remove the memory/WLAN module compartment cover (see
Memory module on page 54).
Remove the RTC battery:
Remove the RTC battery from the socket on the system board.
NOTE: The RTC battery is secured to the computer by 2-sided tape. All replacement RTC battery
spare part kits include 2-sided tape.
Reverse this procedure to install the RTC battery. Be sure the RTC battery is installed with the “+” sign
facing up.
56 Chapter 4 Removal and replacement procedures
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