Lenovo ThinkStation P520 User Manual page 141

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 coin-cell battery keeps this information active
when you turn off the computer.
The coin-cell battery normally requires no charging or maintenance throughout its life; however, no battery
lasts forever. If the coin-cell 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 remove or install the coin-cell battery, do the following:
1. Prepare your computer. See "Preparing your computer and removing the computer cover" on page 63.
2. Locate the coin-cell battery. See "Parts on the system board" on page 7.
3. Remove any parts that might impede your access to the coin-cell battery. Depending on your computer
model, you might need to remove the following parts for easier access to the coin-cell battery.
• "PCIe card" on page 109
• "Full-length PCIe card" on page 115
• "Super capacitor module" on page 119
4. Remove the old coin-cell battery as shown.
Figure 118. Removing the coin-cell battery
5. Install a new coin-cell battery as shown.
Figure 119. Installing a coin-cell battery
6. Reinstall the PCIe cards or the super capacitor module if you have removed them. See "PCIe card" on
page 109, "Full-length PCIe card" on page 115, or "Super capacitor module" on page 119.
7. Reinstall the computer cover and connect the cables. See "Completing the parts replacement" on page
134.
Note: When the computer is turned on for the first time after the coin-cell battery is replaced, an error
message might be displayed. This is normal after the coin-cell battery is replaced.
8. Turn on the computer and all attached devices.
.
Chapter 7 Hardware removal and installation
127