Lenovo ThinkCentre M75t Gen 2, User Manual, Page: 57 / 98

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.
To dispose of the coin-cell battery, refer to the “Lithium coin-cell battery notice” in the Safety and Warranty
Guide .
For access, remove the following parts in order:
• “Computer cover” on page 40
• “Front bezel” on page 40
• “Drive bay assembly” on page 43
Removal steps
Note: After installing a new coin-cell battery, reset the system date and time in the UEFI BIOS menu.
E-lock
Prerequisite
Before you start, read Appendix A “Important safety information” on page 59 and print the following
instructions.
Note: To remove the screws, you need a special tool (T15 star wrench).
For access, do the following:
1. Remove the computer cover. See “Computer cover” on page 40.
2. Disconnect the E-lock cable from the system board.
Chapter 7
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CRU replacement
51