Replacing The Coin-Cell Battery - Lenovo ThinkCentre M800 Hardware Maintenance Manual

Replacing the coin-cell battery

Attention: Do not open your computer or attempt any repair before reading and understanding the Chapter
1 "Read this first: Important safety information" on page 1.
Your computer has a special type of memory that maintains the date, time, and settings for built-in features,
such as parallel-connector assignments (configuration). A coin-cell battery keeps this information active
when you turn off the computer.
The coin-cell battery normally requires no charging or maintenance throughout its life; however, no coin-cell
battery lasts forever. If the coin-cell battery fails, the date, time, and configuration information (including
passwords) are lost. An error message is displayed when you turn on the computer.
Refer to the "Lithium coin-cell battery notice" in the Safety, Warranty, and Setup Guide for information about
replacing and disposing of the coin-cell battery.
To replace the coin-cell battery, do the following:
1. Remove any media from the drives and turn off all connected devices and the computer. Then,
disconnect all power cords from electrical outlets and disconnect all cables that are connected to the
computer.
2. Remove the computer cover. See "Removing the computer cover" on page 88.
3. Remove the heat sink fan duct. See "Replacing the heat sink and fan assembly" on page 137.
4. Locate the coin-cell battery. See "Computer components" on page 31.
5. Remove any parts that might prevent your access to the coin-cell battery. Depending on your computer
model, you might need to remove the PCI Express x16 graphics card for easier access to the coin-cell
battery. See "Replacing a PCI Express card" on page 134.
6. Remove the coin-cell battery as shown.
Figure 96. Removing the coin-cell battery
7. Install the new coin-cell battery as shown.
Figure 97. Installing the coin-cell battery
8. Reinstall the PCI Express x16 graphics card if you have removed it. See "Replacing a PCI Express
card" on page 134.
9. Reinstall the heat sink fan duct. See "Replacing the heat sink and fan assembly" on page 137.
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ThinkCentre M800 and M900 Hardware Maintenance Manual