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7. Position the new memory module over the memory slot. Make sure that the notch 1 on the new memory
module is aligned with the key 2 in the memory slot. Then, press the new memory module straight down
into the memory slot until the retaining clips close and the new memory module snaps into position.
Figure 15. Installing the memory module
8. Reinstall any parts and reconnect any cables that have been removed or disconnected.
What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 43
.
Replacing the battery
Attention:
Do not open your computer or attempt any repair before reading and understanding the “Important safety information”
in the ThinkCentre Safety and Warranty Guide that came with your computer. To obtain a copy of the ThinkCentre
Safety and Warranty Guide, go to:
http://www.lenovo.com/support
Your computer has a special type of memory that maintains the date, time, and conguration information for
built-in features. The 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 conguration information, including passwords, are lost. An
error message is displayed when you turn on the computer.
Before performing the following procedure, be sure to read and understand the information about replacing
and disposing of the battery in the “Batteries” and “Lithium battery notice” sections of the ThinkCentre
Safety and Warranty Guide.
To replace the battery, do the following:
1. Remove all media from the drives and turn off all attached 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 14.
3. Pivot the drive bay assembly upward. See “Accessing the system board components and drives”
on page 16.
4. Locate the battery. See “Locating parts on the system board” on page 9.
22 ThinkCentre User Guide