Hardware Reference Guide
IMPORTANT: Removing the battery with the AC power cord removed will cause the system to load default
BIOS settings the next time the computer is turned on, and the system’s real-time clock may also need to be
set. If the system’s current BIOS settings have been modied from the factory conguration and not saved,
then the resulting BIOS conguration will be set back to the factory defaults. To save the current settings
before replacing the battery, select the Save Custom Defaults link in the BIOS (F10) Setup Main menu. These
saved settings will be restored after the battery replacement.
Static electricity can damage the electronic components of the computer or optional equipment. Before
beginning these procedures, ensure that you are discharged of static electricity by briey touching a
grounded metal object.
NOTE: The lifetime of the lithium battery can be extended by plugging the computer into a live AC outlet.
The lithium battery is only used when the computer is NOT connected to AC power.
HP encourages customers to recycle used electronic hardware, HP original print cartridges, and rechargeable
batteries. For more information about recycling programs, go to http://www.hp.com/recycle.
To locate the battery on the system board, see Locating internal components on page 30.
1. Remove the access panel.
For instructions, see Removing the computer access panel on page 28.
2. To release the battery from its holder, squeeze the metal clamp that extends above one edge of the
battery. When the battery pops up, lift it out (1).
3. To insert the new battery, slide one edge of the replacement battery under the holder’s lip with the
positive side up (2). Push the other edge down until the clamp snaps over the other edge of the battery.
4. Reinstall the access panel.
For instructions, see Replacing the computer access panel on page 29.
5. Turn on the computer.
6. Reset the date and time if necessary.
Replacing the RTC Battery 33