Lenovo ThinkEdge SE455 V3 User Manual page 96

Figure 58. CMOS battery locations on the system board
3V security battery (CR2032)
1
Note: If 3V security battery (CR2032) is replaced, the system enters System Lockdown Mode and
needs to be activated or unlocked. See
Step 3. Align the CMOS battery with the base of the seat, with negative (-) side faces middle of the chassis.
Then, pivot the top of the battery until the battery clicks in place.
88 ThinkEdge SE455 V3 User Guide
3V system battery (CR2032)
2
"Activate or unlock the system" on page 255.