RTC battery – WWAN models
NOTE: RTC battery location varies on model with and without WWAN modules.
WWAN models: you must remove the system board to replace the RTC battery.
Non-WWAN models: you must remove only the service cover to replace the RTC battery.
Description Spare part number
RTC battery for use in models with Intel processors with WWAN 721532-001
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 36).
5. Remove the following components:
a. Service door (see
Service door on page 37).
b. Hard drive (see
Hard drive on page 38)
c. Optical drive (see
Optical drive on page 41)
d. WLAN/Bluetooth module (see
WLAN/Bluetooth combo card on page 45)
e. WWAN module (see
WWAN module on page 47)
f. Keyboard (see
Keyboard on page 49)
g. Top cover (see
Top cover on page 53)
h. System board (see
System board on page 66)
Remove the RTC battery:
1. Position the system board upside-down.
2. Disconnect the cable from the system board connector (1).
Component replacement procedures 71
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