11. Install the screw that secures the optical drive box on the VESA mount bracket.

Figure 33. 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 10.

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 75.

Replacing the battery

Attention:

Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page v.

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, 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 33.

48ThinkCentre User Guide

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Lenovo 3856, 3267, 3264, 3263, 3273, 4156, 4004, 3261 manual Replacing the battery, What to do next

4004, 3263, 3264, 4156, 3261 specifications

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