Lenovo ThinkPad X380 Yoga User Manual page 116

1. Disable the built-in battery. See "Disabling the built-in battery" on page 92.
2. Ensure that the computer is turned off and disconnected from ac power and all cables.
3. Close the computer display and turn the computer over.
4. Remove the base cover assembly. See "Replacing the base cover assembly" on page 93.
5. Detach the connector and then remove the coin-cell battery.
6. Install the new coin-cell battery and attach the connector.
7. Reinstall the base cover assembly.
8. Turn the computer over. Connect the ac power adapter and all cables to the computer.
9. Reset the system date and time in the ThinkPad Setup program. See "Date/Time menu" on page 63.
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X380 Yoga User Guide