Replacing The Battery - Lenovo ThinkStation P900 Hardware Maintenance Manual

Replacing the 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 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 disposing of the battery.
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 111.
3. Remove the direct cooling air baffle. See "Removing and reinstalling the direct cooling air baffle" on
page 128.
4. To access the battery, you must remove the power supply assembly, the upper front fan assembly,
and the upper multi-function bracket. See "Replacing the power supply assembly" on page 143,
"Replacing the front fan assemblies" on page 141, and "Removing and reinstalling the multi-function
brackets" on page 139.
5. Locate the battery. See "Locating parts on the system board" on page 34.
6. Remove the old battery as shown.
Figure 58. Removing the battery
7. Install the new battery as shown.
Figure 59. Installing the battery
.
Chapter 11 Installing or replacing hardware
145