Lenovo ThinkCentre M625q 10TG User Manual And Hardware Maintenance Manual page 59

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, time, and configuration information (including
passwords) are lost. An error message is displayed when you turn on the computer.
1. Remove any media from the drives and turn off all connected devices and the computer.
2. Disconnect all power cords from electrical outlets and disconnect all cables that are connected to the
computer.
3. Remove the computer cover. For details, see "Removing the computer cover" on page 28.
4. Remove the storage drive if necessary. For details, see "Replacing the storage drive for 10TF, 10TG,
10TH, 10TJ, and 10TK models" on page 30.
5. Remove the heat sink if necessary. For details, see "Replacing the heat sink" on page 36.
6. Replace the coin-cell battery.
a. Press the metallic tab as shown.
Figure 72. Unlocking the microprocessor socket retainer
b. Remove the coin-cell battery.
Figure 73. Pivoting the microprocessor socket upward
.
Chapter 4 Replacing hardware
55