Coin-Cell Battery - Lenovo ThinkCentre M90s Gen 2 Hardware Maintenance Manual

• Before installing a new PCI-Express card, remove any PCI-Express connector cables that impede the
installation. See "PCI-Express connector cable" on page 76.

Coin-cell battery

Prerequisite
Before you start, read Generic Safety and Compliance Notices, and print the following instructions.
Your computer has a special type of memory that maintains the date, time, and settings for built-in features,
such as parallel connector assignments (configurations). 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 coin-cell
battery lasts forever. If the coin-cell battery fails, the date and time information is lost. An error message is
displayed when you turn on the computer.
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Chapter 6 Hardware removal and installation