Removal and replacement procedures 4–12
RTC battery
✎Removing the RTC battery and leaving it uninstalled for 5 or more minutes causes all passwords and CMOS
settings to be cleared.
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 4-7).
5. Remove the hard drive cover (see “Hard drive” on page4-10).
Remove the RTC battery:
1. Disconnect the RTC battery cable 1 from the system board.
2. Remove the RTC battery 2 from the clip built into the base enclosure. The RTC battery is attached to the
system board with double-sided tape.
Reverse this procedure to install the RTC battery.
Description Spare part number
RTC battery 501587-001