Dell Precision T5400 User's Guide - Page 177
Replacing the Battery, found in system setup see
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The battery may need replacing if you have repeatedly reset the time and date information after turning on the computer or if one of the following messages appear: Time-of-day not set - please run SETUP program or Invalid configuration information please run SETUP program or Strike the F1 key to continue, F2 to run the setup utility To determine whether you need to replace the battery, re-enter the time and date in system setup and exit the program to save the information. Turn off your computer and disconnect it from the electrical outlet for a few hours; then reconnect the computer, turn it on, and enter the system setup program (see "System Setup" on page 89). If the date and time are not correct in system setup, replace the battery. You can operate your computer without a battery; however, without a battery, the configuration information is erased if the computer is turned off or unplugged from the electrical outlet. In this case, you must enter the system setup program (see "System Setup" on page 89) and reset the configuration options. Replacing the Battery 1 If you have not already done so, write down the configuration information found in system setup (see "System Setup" on page 89). 2 Follow the procedures in "Before You Begin" on page 151. 3 Remove the computer cover (see "Removing the Computer Cover" on page 153). 4 Locate the battery socket (see "System Board Components" on page 28). 5 If necessary, disconnect any cables that block access to the battery socket. Adding and Replacing Parts 177