HP ProBook 6550b HP ProBook 6455b, 6555b, 6450b,and 6550b Notebook PCs - Maint - Page 110
RTC battery, from the system board.
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RTC battery Description RTC battery (includes cable and double-sided tape) Spare part number 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 79). 5. Remove the keyboard (see Keyboard on page 96). Remove the RTC battery: 1. Disconnect the RTC battery cable (1) from the system board. 2. Detach the RTC battery (2) from the clip built into the top cover. (The RTC battery is attached to the top cover with double-sided tape.) Reverse this procedure to install the RTC battery. When installing the RTC battery, make sure the "+" sign faces up. 102 Chapter 4 Removal and replacement procedures