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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 480468-001
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 54).
5. Remove the accessory cover (see
Hard drive on page 59).
Remove the RTC battery:
1. Disconnect the RTC battery cable (1) from the system board.
2. Remove the RTC battery (2) from the rubber clip built into 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 63