•  To order replacement batteries, call your support center or business partner. For Lenovo support 
telephone numbers, see 
https://datacentersupport.lenovo.com/supportphonelist for your region support 
details.
Note: After you replace the CMOS battery, you must reconfigure the server and reset the system date and 
time.
S004 
CAUTION: 
When replacing the lithium battery, use only Lenovo specified part number or an equivalent type 
battery recommended by the manufacturer. If your system has a module containing a lithium battery, 
replace it only with the same module type made by the same manufacturer. The battery contains 
lithium and can explode if not properly used, handled, or disposed of.
Do not: 
•  Throw or immerse into water
•  Heat to more than 100°C (212°F)
•  Repair or disassemble
Dispose of the battery as required by local ordinances or regulations.
S002 
CAUTION: 
The power-control button on the device and the power switch on the power supply do not turn off the 
electrical current supplied to the device. The device also might have more than one power cord. To 
remove all electrical current from the device, ensure that all power cords are disconnected from the 
power source.
Attention: 
•  Read “Installation Guidelines” on page 47 and “Safety inspection checklist” on page 48 to ensure that you 
work safely.
•  Power off the server and peripheral devices and disconnect the power cords and all external cables. See 
“Power off the server” on page 62.
Procedure
Step 1.  Make preparation for the task. 
a.  If the server is installed in a rack, slide the server out on its rack slide rails to gain access to the 
top cover, or remove the server from the rack. See 
“Remove the server from rack” on page 63.
b.  Remove the top cover. See 
“Remove the top cover” on page 277.
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ThinkSystem SR665 V3 User Guide