Lenovo IdeaPad 3-15IML05 CMOS Battery Replacement

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If your Lenovo IdeaPad 3-15IML05 can’t find boot drives, displays wrong time, and keeps losing its BIOS settings, use this guide to replace your CMOS Battery.

The CMOS Battery provides continuous power to a chip within your motherboard. This allows it to store information regarding boot drives, time, and BIOS settings. Over time, the CMOS Battery can degrade and stop supplying power to the CMOS chip. Replacing the CMOS Battery allows the computer to store BIOS information, even when powered off. After replacement, you may need to manually configure BIOS settings.

Working with lithium-ion batteries can be hazardous. A connected or swollen battery may catch fire if damaged. Before beginning this repair, discharge the battery below 25%, power off the laptop, and unplug all peripherals.

If you encounter a swollen battery, refer to this guide for disposal.

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crwdns2931653:01crwdne2931653:0 Lower Case

Lenovo IdeaPad 3-15IML05 CMOS Battery Replacement, Lower Case: crwdns2935265:01crwdnd2935265:01crwdnd2935265:02crwdne2935265:0

Lenovo IdeaPad 3-15IML05 CMOS Battery Replacement, Lower Case: crwdns2935265:01crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

Before beginning, discharge the battery below 25%, power the device off, and disconnect all peripherals.
Use a Phillips #1 screwdriver to remove the following screws:
Six 7 mm screws
Four 4 mm screws

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Lenovo IdeaPad 3-15IML05 CMOS Battery Replacement: crwdns2935265:02crwdnd2935265:01crwdnd2935265:02crwdne2935265:0

Lenovo IdeaPad 3-15IML05 CMOS Battery Replacement: crwdns2935265:02crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

Insert an opening pick into the seam between the lower case and chassis.
Slide the pick around the entire perimeter until all of the plastic retaining clips release.
Remove the lower case.
Forcing the back cover open could break the plastic retaining clips.
During reassembly, lay the cover flat and press around the edges to secure it to the plastic clips.

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crwdns2931653:03crwdne2931653:0 Lenovo IdeaPad 3-15IML05 Battery Disconnection

Lenovo IdeaPad 3-15IML05 CMOS Battery Replacement, Lenovo IdeaPad 3-15IML05 Battery Disconnection: crwdns2935265:03crwdnd2935265:01crwdnd2935265:02crwdne2935265:0

Lenovo IdeaPad 3-15IML05 CMOS Battery Replacement, Lenovo IdeaPad 3-15IML05 Battery Disconnection: crwdns2935265:03crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

Use a plastic spudger or your fingernail to gently push the JST battery connector out of its socket.
Pulling directly on the cable could damage the connector.

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crwdns2931653:04crwdne2931653:0 CMOS Battery

Lenovo IdeaPad 3-15IML05 CMOS Battery Replacement, CMOS Battery: crwdns2935265:04crwdnd2935265:01crwdnd2935265:03crwdne2935265:0

Lenovo IdeaPad 3-15IML05 CMOS Battery Replacement, CMOS Battery: crwdns2935265:04crwdnd2935265:02crwdnd2935265:03crwdne2935265:0

Lenovo IdeaPad 3-15IML05 CMOS Battery Replacement, CMOS Battery: crwdns2935265:04crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

Using a spudger or tweezers, push the CMOS battery JST connector out of its socket.
Pulling directly on the cables could damage the connector.

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Lenovo IdeaPad 3-15IML05 CMOS Battery Replacement: crwdns2935265:05crwdnd2935265:01crwdnd2935265:02crwdne2935265:0

Lenovo IdeaPad 3-15IML05 CMOS Battery Replacement: crwdns2935265:05crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

Grasp and remove the CMOS battery, which is secured with adhesive.
Prying tools, such as a spudger, can be used to remove the CMOS battery.

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To reassemble your device, follow the above steps in reverse order.
Take your e-waste to an R2 or e-Stewards certified recycler.
Repair didn’t go as planned? Try some basic troubleshooting or ask our Answers community for help.