HP ProBook 6455b, 6555b, 6450b and 6550b Notebook PCs Maintenance and Service Guide

RTC battery
Description Spare part number
For use only on HP Compaq 6550b and 6450b computer models 449137-001
Before removing the real-time clock (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 74).
5. Remove the keyboard (see
Keyboard on page 90).
Remove the RTC battery:
▲
Use a thin, non-conductive tool to remove the RTC battery from the socket on the system board.
Reverse this procedure to install the RTC battery. When installing the RTC battery, make sure the “+”
sign faces up.
96 Chapter 4 Removal and replacement procedures