HP ProBook 450 G2 Notebook PC HP ProBook 455 G2 Notebook PC Maintenance and Service Guide

RTC battery, HP 450 models
Description Spare part number
RTC battery 738824-001
On HP 450 models, you must remove the system board to access the RTC battery.
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 43).
5. Remove the following components:
a. Service doors (see
Service door on page 44).
b. Hard drive (see
Hard drive on page 46)
c. Optical drive (see
Optical drive on page 50)
d. Keyboard (see
Keyboard on page 56)
e. Top cover (see
Top cover on page 64)
f. System board (see
System board on page 84)
Remove the RTC battery:
1. Position the system board upside-down.
2. Using a flat tool, pry the battery out of the socket (1).
90 Chapter 6 Removal and replacement procedures for Authorized Service Provider parts