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5. Install the new coin-cell battery
1
, and then attach the connector
2
.
6. Reinstall the base cover assembly.
7. Connect the ac power adapter and all disconnected cables to the computer.
8. Reset the system date and time in the UEFI BIOS menu. See “Set the system date and time” on page 42.
WWAN card (for selected models)
The following information is only for the computer with user-installable modules. Ensure that you use only a
Lenovo-authorized wireless module specifically tested for this computer model. Otherwise, the computer will
generate an error-code beep sequence when you turn on the computer.
Prerequisite
Before you start, read Appendix A “Important safety information” on page 73 and print the following
instructions.
Attention:
Do not touch the contact edge of the wireless-WAN card. Otherwise the wireless-WAN card
might get damaged.
Replacement procedure
1. Disable the built-in battery. See “Disable Fast Startup and the built-in battery” on page 47.
2. Turn off the computer and disconnect the computer from ac power and all connected cables. Then,
close the computer display.
3. Remove the base cover assembly. See “Base cover assembly” on page 48.
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T495 User Guide
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