Rtc Battery - Compaq Presario CQ45 Maintenance And Service Manual

RTC battery

NOTE: Removing the RTC battery and leaving it uninstalled for 5 or more minutes causes all
passwords and CMOS settings to be cleared.
Description
RTC battery (includes 2-sided tape)
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
Remove the RTC battery:
1. Remove the two Phillips PM2.5×6.0 screws (1) that secure the RTC battery compartment cover to
the computer.
2. Lift the right side of the cover (2), swing it to left, and remove the cover (3). The RTC battery
compartment cover is included in the Plastics Kit, spare part number 486862-001.
3. Disconnect the RTC battery cable (1) from the system board.
50 Chapter 4 Removal and replacement procedures
Battery on page 41).
Spare part number
486835-001