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RTC battery
Description Spare part number
RTC battery 725458-001
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 service cover (see
Service cover on page 30).
5. Disconnect the battery cable (see
Battery on page 32).
Remove the RTC battery:
1. Disconnect the RTC battery cable from the system board (1).
NOTE: Use a thin, non-conductive tool to remove the RTC battery from the socket on the system
board.
2. Remove the RTC battery (2). (The RTC battery is attached to the system board by double-sided
adhesive.)
Reverse this procedure to install the RTC battery on computer models. When installing the RTC battery,
make sure the “+” sign faces up.
Component replacement procedures
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