Replacing The Battery - Lenovo ThinkCentre M72e Hardware Maintenance Manual

11. Install the screw that secures the optical drive box on the VESA mount bracket.
Figure 31. Installing the screw that secures the optical drive box
12. Connect the secondary hard disk drive cable to a USB connector on the computer. See "Locating
connectors on the rear of your computer" on page 68.
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 123.

Replacing the battery

Attention: Do not open your computer or attempt any repair before reading and understanding the "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-port 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 battery notice" in the Safety and Warranty 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 77.
3. Locate the battery. See "Locating parts on the system board" on page 72.
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ThinkCentre Hardware Maintenance Manual