Replacing The Battery - HP EliteDesk 800 Hardware Reference Manual

17. Reconnect external devices, plug in the power cord, and then turn on the computer.
18. Lock any security devices that were disengaged when the access panel was removed.

Replacing the battery

The battery that comes with the computer provides power to the real-time clock. When replacing the battery,
use a battery equivalent to the battery originally installed in the computer. The computer comes with a 3-volt
lithium coin cell battery.
WARNING!
burns if the battery is not handled properly. To reduce the risk of personal injury:
Do not attempt to recharge the battery.
Do not expose to temperatures higher than 60°C (140°F).
Do not disassemble, crush, puncture, short external contacts, or dispose of in fire or water.
Replace the battery only with the HP spare designated for this product.
CAUTION:
battery is removed or replaced, the CMOS settings will be cleared.
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 briefly touching a
grounded metal object.
NOTE: The lifetime of the lithium battery can be extended by plugging the computer into a live AC wall
socket. 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.
1. Remove/disengage any security devices that prohibit opening the computer.
2. Remove all removable media, such as a USB flash drive, from the computer.
3. Turn off the computer properly through the operating system, then turn off any external devices.
4. Disconnect the power cord from the AC outlet and disconnect any external devices.
CAUTION:
the system is plugged into an active AC outlet. You must disconnect the power cord to avoid damage to
the internal components of the computer.
5. Remove the access panel.
For instructions on removing the access panel from a 35W model, see
●
of the HP EliteDesk 800 35W on page
For instructions on removing the access panel from any other model, see
●
panel on page
WARNING!
to cool before you touch them.
6. If your model is an EliteDesk 800 95W, remove the fan assembly.
30 Chapter 3 Hardware upgrades
The computer contains an internal lithium manganese dioxide battery. There is a risk of fire and
Before replacing the battery, it is important to back up the computer CMOS settings. When the
Regardless of the power-on state, voltage is always present on the system board as long as
10.
To reduce risk of personal injury from hot surfaces, allow the internal system components
11.
Removing the access panel
Removing the access