Follow the instructions to replace the base cover assembly.

Before you start, read Generic Safety and Compliance Notices and print the following instructions.

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 Fast Start up and the built-in battery. See Before you replace any CRU.
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.

Tool needed: Phillips head screwdriver

If the computer does not start up after you reinstall the base cover assembly, disconnect the ac power adapter and then reconnect it to the computer.

Follow the instructions to replace the built-in battery.

Before you start, read Generic Safety and Compliance Notices and print the following instructions.

CAUTION:
Use only the Lenovo-authorized battery specified for the computer. Any other battery could ignite or explode.

Batteries supplied by Lenovo for use with your product have been tested for compatibility and should only be replaced with approved parts. A battery other than the one specified by Lenovo, or a disassembled or modified battery may not be covered by warranty.

Battery abuse or mishandling can cause overheat, liquid leakage, or an explosion. To avoid possible injury:

• Do not open, disassemble or service any battery unless you are competent to do so and ensure that you carefully follow all instructions provided by Lenovo.
• Do not crush or puncture the battery.
• Do not short-circuit the battery, or expose it to water or other liquids.
• Keep the battery away from children.
• Keep the battery away from fire.
• Stop using the battery if it is damaged, or if you notice any discharge or the buildup of foreign materials on the battery leads.
• Store the rechargeable batteries or products containing the rechargeable batteries at room temperature, charged to approximately 30 to 50% of capacity. We recommend that the batteries be charged about once per year to prevent overdischarge.
• Do not put the battery in trash that is disposed of in landfills. When disposing of the battery, comply with local ordinances or regulations.
• If the battery is incorrectly replaced, there is danger of an explosion. The battery contains a small amount of harmful substances.

Lenovo recommends you use a qualified repair technician or ensure that you carefully follow all instructions provided by Lenovo. The Lenovo-authorized repair facilities or technicians recycle Lenovo batteries according to local laws and regulations. Please do not dispose of your battery with your household waste. For recycling information go to https://www.lenovo.com/recycling.

Attention: Lenovo has no responsibility for the performance or safety of unauthorized batteries, and provides no warranties for failures or damage arising out of their use.

The Vantage app provides an automatic battery diagnostic test that determines if the built-in battery is defective. A built-in battery should not be replaced unless this diagnostic test shows that the battery is defective. The only exception to this is if the built-in battery is physically damaged or a customer is reporting a possible safety issue.

If the Vantage app is not installed on the computer, the customer should download and install the program to diagnose the built-in battery, before replacing a non-physically damaged built-in battery. Note that the replacement of a physically damaged built-in battery is not covered by the warranty.

For access, do the following:

1. Disable Fast Start up and the built-in battery. See Before you replace any CRU.
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.
4. Remove the base cover assembly. See Base cover assembly.

Tool needed: Phillips head screwdriver

Follow the instructions to replace the Wireless WAN module.

The following information is only for the computer with user-installable modules.

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.

Before you start, read Generic Safety and Compliance Notices and print the following instructions.

Notes:

• Wireless WAN ready model identifies that product has preinstalled wireless WAN antennas and allows a user-installable wireless WAN module.
• Only wireless WAN model or wireless WAN ready model is allowed to install the optional Lenovo wireless WAN module.

Attention: Do not touch the contact edge of the wireless WAN module. Otherwise, the wireless WAN module might get damaged.

For access, do the following:

1. Disable Fast Start up and the built-in battery. See Before you replace any CRU.
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.
4. Remove the base cover assembly. See Base cover assembly.

Tools needed:

• Phillips head screwdriver
• Pry tool

Type one – 4G wireless WAN module

Type two – 5G wireless WAN module

Type three – captive bracket only

Antenna cable routing (for selected models)

The cable routing is different for 4G wireless WAN module and 5G wireless WAN module. Ensure that the antenna cables are installed appropriately when installing a wireless WWAN module.

Follow the instructions to replace the M.2 solid-state drive and M.2 solid-state drive bracket.

Before you start, read Generic Safety and Compliance Notices and print the following instructions.

Attention:

• If you replace an M.2 solid-state drive, you might need to install a new operating system. For details on how to install a new operating system, see Install a Windows operating system.

The M.2 solid-state drive is sensitive. Inappropriate handling might cause damage and permanent loss of data.

When handling the M.2 solid-state drive, remove or insert the M.2 solid-state drive horizontally. Otherwise the slot might get damaged.

When handling the M.2 solid-state drive, observe the following guidelines:

• Replace the M.2 solid-state drive only for repair. The M.2 solid-state drive is not designed for frequent changes or replacement.
• Before replacing the M.2 solid-state drive, make a backup copy of all the data that you want to keep.
• Do not apply pressure to the M.2 solid-state drive.
• Do not touch the contact edge or circuit board of the M.2 solid-state drive. Otherwise, the M.2 solid-state drive might get damaged.
• Do not subject the M.2 solid-state drive to physical shocks or vibration. Put the M.2 solid-state drive on a soft material, such as cloth, to absorb physical shocks.

1. Disable Fast Start up and the built-in battery. See Before you replace any CRU.
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.
4. Remove the base cover assembly. See Base cover assembly.

Tool needed: Phillips head screwdriver