Lenovo ThinkCentre M73 10DL User Manual page 73

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 battery keeps this information active when you
turn off the computer.
The battery normally requires no charging or maintenance throughout its life; however, no battery lasts
forever. If the 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 battery.
To replace the battery, do the following:
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See "Removing the computer cover" on page 55.
3. Locate the battery. See "Locating parts on the system board" on page 12.
4. Remove the hard disk drive assembly to get access to the battery. See "Installing or removing the
hard disk drive assembly" on page 57.
5. Remove the old battery.
Figure 45. Removing the old battery
6. Install a new battery.
Figure 46. Installing a new battery
7. Reinstall the hard disk drive assembly. See "Installing or removing the hard disk drive assembly"
on page 57.
8. Reinstall the computer cover and connect the cables. See "Completing the parts replacement" on
page 80.
Note: When the computer is turned on for the first time after replacing the battery, an error message
might be displayed. This is normal after replacing the battery.
9. Turn on the computer and all attached devices.
.
Chapter 5 Installing or replacing hardware
61