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RTC battery
Description Spare part number
RTC battery 507707-001
NOTE: 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 real-time clock (RTC) battery, follow these steps:
1. Shut down the device. If you are unsure whether the device is off or in Hibernation, turn the device
on, and then shut it down through the operating system.
2. Disconnect all external devices connected to the device.
3. Disconnect the power from the device by first unplugging the power cord from the AC outlet and
then unplugging the AC adapter from the device.
4. Remove the battery (see
Battery on page 37).
5. Remove the following components:
a. Keyboard (see
Keyboard on page 40)
b. Hard drive or solid-state drive (see
Mass storage devices on page 42)
c. Top cover (see
Top cover on page 45)
Remove the RTC battery:
1. Disconnect the RTC battery cable (1) from the system board.
2. Detach the RTC battery (2) from the system board.
NOTE: The RTC battery is attached to the system board with double-sided tape.
Reverse this procedure to install the RTC battery.
52 Chapter 4 Removal and replacement procedures