HP 240 HP 450 Notebook PC and HP 455 Notebook PC Maintenance and Service Guide - Page 65
RTC battery, Remove the hard drive compartment cover see
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RTC battery Description RTC battery Spare part number 449137-001 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 41). 5. Remove the memory module/wireless module compartment cover (see WLAN module on page 49). 6. Remove the hard drive compartment cover (see Hard drive on page 54). To remove the RTC battery: ▲ Insert a screwdriver or similar small tool between the battery and the clip that secures it (1), pry the battery up to disengage it from the socket, and then remove the battery (2). Reverse this procedure to install the RTC battery. Component replacement procedures 57