Lenovo ThinkPad P52s User Manual page 130

1. Disable the built-in battery. See "Disabling the built-in battery" on page 100.
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 removable battery. See "Replacing the removable battery" on page 100.
5. Remove the base cover assembly. See "Replacing the base cover assembly" on page 103.
6. Disconnect the cable from the system board.
7. Pull the tape to remove the adaptor that has the M.2 solid-state drive installed.
8. Disconnect the cable from the adaptor.
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T580 and P52s User Guide