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Step 5.
Clear the Turn on fast startup check box, and then click Save changes.
To disable the built-in battery
Step 1.
Restart your computer. When the logo screen is displayed, immediately press F1 to enter the UEFI
BIOS menu.
Select Config ➙ Power. The Power submenu is displayed.
Step 2.
Step 3.
Select Disable built-in battery and press Enter.
Step 4.
Select Yes in the Setup Confirmation window.
The built-in battery is disabled and the computer turns off automatically.
Wait three to five minutes to let the computer cool.
Notes: If your computer cannot enter the UEFI BIOS menu, you cannot disable the built-in battery. To avoid
short circuit when you replace a part, it is recommended to do the following:
• For the built-in battery connected to the system board with cables: Disconnect the battery cables.
• For the built-in battery connected to the system board with combo connectors: Disconnect the
connectors by removing the battery. For the removal procedure, refer to the built-in battery replacement
instructions in this documentation.
Removing the nano-SIM card and nano-SIM-card tray
Note: If the computer you are servicing has a nano-SIM card installed, remove the card with the tray
together.
Base cover assembly
Follow the instructions to replace the base cover assembly.
Before you start, read
Generic Safety and Compliance Notices
Note: Do not remove the base cover assembly when your computer is connected to ac power. Otherwise,
there might be a risk of short circuits.
For access, do the following:
1. Disable the built-in battery. See "Disabling the built-in battery" on page 57.
2. Turn off the computer and disconnect the computer from ac power and all connected cables.
3. Close the computer display and turn over the computer.
58
ThinkPad T14s Gen 5 Hardware Maintenance Manual
and print the following instructions.
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