Lenovo ThinkPad T450 User Manual page 145

6. Install the new coin-cell battery 1 and attach the connector 2 .
7. Reinstall the base cover assembly. See "Replacing the base cover assembly" on page 113.
8. Reinstall the removable battery. See "Replacing the removable battery" on page 110.
9. Turn the computer over again. Connect the ac power adapter and all cables to the computer.
10. Turn on the computer and enter the ThinkPad Setup program. Then reset the date and time.
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Chapter 9 Replacing devices