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Lenovo ThinkPad T490 CMOS Battery Replacement

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This guide will show you how to replace the CMOS (complementary metal oxide semiconductor) battery on your Lenovo ThinkPad T490.

You may require replacement of the CMOS or coin cell battery if the laptop's setting setup randomly changes, the clock resets on its own, “Booting Error” messages appear, or the laptop runs slowly.

Before one begins, make sure to power down your device and disconnect from any external power sources.

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  1. Lenovo ThinkPad T490 CMOS Battery Replacement, CMOS Battery: crwdns2935265:01crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Using a Philips #1 screwdriver fully loosen the six screws on the back cover.

    • These screws are captive - they will not fully come out after being unscrewed.

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  2. Lenovo ThinkPad T490 CMOS Battery Replacement: crwdns2935265:02crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Insert the iFixit opening tool into the space between the baseplate and the chassis.

    • Glide the tool along the perimeter of the case in order to release the clips holding the case and chassis together.

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  4. Lenovo ThinkPad T490 CMOS Battery Replacement: crwdns2935265:03crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Grab the edge of the cover and lift the cover away from you.

    • There may be additional clips holding the cover in place. These remaining clips will release easily as you remove the cover.

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  5. Lenovo ThinkPad T490 CMOS Battery Replacement: crwdns2935265:04crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Lenovo ThinkPad T490 CMOS Battery Replacement: crwdns2935265:04crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

    • Locate the battery socket connector parallel to the motherboard.

    • Slide the battery socket connector out of its socket on the motherboard.

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  6. Lenovo ThinkPad T490 CMOS Battery Replacement: crwdns2935265:05crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Lenovo ThinkPad T490 CMOS Battery Replacement: crwdns2935265:05crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

    • Unplug the connector from the socket on the motherboard.

    • Pry the coin cell battery off of the motherboard.

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  7. Lenovo ThinkPad T490 CMOS Battery Replacement: crwdns2935265:06crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Insert new coin cell battery.

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To reassemble your device, follow these instructions in reverse order.

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I read in a Lenovo "how to" video that you should go into the BIOS and disable the CMOS battery before replacing.

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