System information

RTC battery

Description Spare part number

RTC battery (includes cable and double-sided tape) 640902-001

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 52).

5. Remove the service cover (see

Optical drive on page 53).

Remove the RTC battery:

1. Disconnect the RTC battery cable (1) from the system board.

2. Release the clips (2) built into the base enclosure that secure the RTC battery.

Remove the RTC battery (3). (The RTC battery is attached to the base enclosure with double-

sided tape.)

Reverse this procedure to install the RTC battery.

60 Chapter 4 Removal and replacement procedures