1. Turn off the computer and disconnect all power cords from electrical outlets.2. Remove the computer cover. See “Removing the computer cover” on page 32.3. Locate the battery. See “Locating parts on the system board” on page 12.4. Remove the old battery.Figure28. Removing the old battery5. Install a new battery.Figure29. Installing a new battery6. Reinstall the computer cover and connect the cables. See “Completing the parts replacement” onpage 66.Note: When the computer is turned on for the first time after replacing the battery, an error messagemight be displayed. This is normal after replacing the battery.7. Turn on the computer and all attached devices.8. Use the Setup Utility program to set the date, time, and any passwords. See Chapter 7 “Using the SetupUtility program” on page 77.What to do next:• To work with another piece of hardware, go to the appropriate section.• To complete the installation or replacement, go to “Completing the parts replacement” on page 66.Replacing the power supply assemblyAttention:Do not open your computer or attempt any repair before reading and understanding the “Important safety information”in the ThinkCentre Safety and Warranty Guide that came with your computer. To obtain a copy of the ThinkCentreSafety and Warranty Guide, go to:http://www.lenovo.com/supportThis section provides instructions on how to replace the power supply assembly.Although there are no moving parts in your computer after the power cord has been disconnected, thefollowing warnings are required for your safety and proper Underwriters Laboratories (UL) certification.46 ThinkCentre User Guide
