Desktop Boards
Desktop Boards
CMOS battery

Symptom(s):


Cause:


Solution:

A coin-cell battery (CR2032) powers the real-time clock and CMOS memory. When the computer is not plugged into a wall socket, the battery has an estimated life of three years. When the computer is plugged in, the standby current from the power supply extends the life of the battery. The clock is accurate to plus or minus 13 minutes/year at 25 degrees C with 3.3 VSB applied.

When the voltage drops below a certain level, the BIOS Setup program settings stored in CMOS RAM (such as, the date and time) might not be accurate. If this event occurs, replace the battery with an equivalent one.

Note If the battery and AC power fail, custom defaults (if previously saved) are loaded into CMOS SRAM at power-on. If custom defaults were not saved, BIOS setup defaults load into CMOS SRAM at power-on.

Electrostatic discharge (ESD) can damage components. Apply the procedures described here only at an ESD workstation using an antistatic wrist strap and a conductive foam pad. If a station is not available, you can create some ESD protection by wearing an antistatic wrist strap attached to a metal part of the chassis.

There are several styles of battery placement on Intel® Desktop Boards. To replace the CMOS battery, follow the steps for the style on your board.

Battery is in a horizontal or vertical battery holder:

  1. Turn off all peripheral devices connected to the computer. Disconnect the power cord of the computer from the ac power source (electrical outlet or power adapter).
  2. Remove the computer cover.
  3. Locate the battery on the board.
  4. With a medium flat-bladed screwdriver, gently pry the battery free from its connector. Notice the orientation of the "+" and "-" on the battery.
  5. Install the new battery in the connector, orienting the "+" and "-" correctly.
  6. Replace the computer cover.

Battery is connected to an onboard connector by wires:


This type of CMOS battery is connected to an onboard header on the board by a Molex* 1x2 connector (51020-0200).

  1. Turn off all peripheral devices connected to the computer. Disconnect the computer’s power cord from the AC power source (wall outlet or power adapter).
  2. Remove the computer cover.
  3. Locate the battery on the board.
  4. Disconnect the battery wires from the connector and remove the battery from the back of the I/O stack.
  5. To install the new battery, remove the paper backing from the battery adhesive pad, attach the battery to the I/O stack, and connect the wires to the desktop board.
Note CR2032 batteries with a wire and connector may not be locally available. We recommend you search for online retailers by searching for "CR2032 with wire" or "CR2032 with connector".

This applies to:

Intel® Desktop Board D2500CC
Intel® Desktop Board D2500HN
Intel® Desktop Board D2550DC2
Intel® Desktop Board D2550MUD2
Intel® Desktop Board D2700DC
Intel® Desktop Board D2700MUD
Intel® Desktop Board D410PT
Intel® Desktop Board D425KT
Intel® Desktop Board D510MO
Intel® Desktop Board D525MW
Intel® Desktop Board DB65AL
Intel® Desktop Board DB75EN
Intel® Desktop Board DB85FL
Intel® Desktop Board DH55HC
Intel® Desktop Board DH55PJ
Intel® Desktop Board DH55TC
Intel® Desktop Board DH57DD
Intel® Desktop Board DH57JG
Intel® Desktop Board DH61AG
Intel® Desktop Board DH61AGL
Intel® Desktop Board DH61BE
Intel® Desktop Board DH61BF
Intel® Desktop Board DH61CR
Intel® Desktop Board DH61DL
Intel® Desktop Board DH61HO
Intel® Desktop Board DH61KVCH
Intel® Desktop Board DH61SA
Intel® Desktop Board DH61SKCH
Intel® Desktop Board DH61WW
Intel® Desktop Board DH61ZE
Intel® Desktop Board DH67BL
Intel® Desktop Board DH67CF
Intel® Desktop Board DH67CL
Intel® Desktop Board DH67GD
Intel® Desktop Board DH67VR
Intel® Desktop Board DH77DF
Intel® Desktop Board DH77EB
Intel® Desktop Board DH77KC
Intel® Desktop Board DH87MC
Intel® Desktop Board DH87RL
Intel® Desktop Board DN2800MT
Intel® Desktop Board DP55KG
Intel® Desktop Board DP55SB
Intel® Desktop Board DP55WB
Intel® Desktop Board DP55WG
Intel® Desktop Board DP67BA
Intel® Desktop Board DP67BG
Intel® Desktop Board DP67DE
Intel® Desktop Board DQ57TM
Intel® Desktop Board DQ57TML
Intel® Desktop Board DQ67EP
Intel® Desktop Board DQ67OW
Intel® Desktop Board DQ67SW
Intel® Desktop Board DQ77CP
Intel® Desktop Board DQ77KB
Intel® Desktop Board DQ77MK
Intel® Desktop Board DQ87PG
Intel® Desktop Board DX58OG
Intel® Desktop Board DX58SO
Intel® Desktop Board DX58SO2
Intel® Desktop Board DX79SI
Intel® Desktop Board DX79SR
Intel® Desktop Board DX79TO
Intel® Desktop Board DZ68AF
Intel® Desktop Board DZ68BC
Intel® Desktop Board DZ68DB
Intel® Desktop Board DZ68PL
Intel® Desktop Board DZ68ZV
Intel® Desktop Board DZ75ML-45K
Intel® Desktop Board DZ77BH-55K
Intel® Desktop Board DZ77GA-70K
Intel® Desktop Board DZ77RE-75K
Intel® Desktop Board DZ77SL-50K
Intel® Desktop Board DZ87KLT-75K

Solution ID: CS-002839 (1.0.1333462.3300310)
Last Modified: 13-May-2014
Date Created: 26-Dec-2002