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Introduction |
| If the coin cell or CMOS battery of your Lenovo ThinkPad T480 begins to fail, follow this guide to replace it. | | The CMOS or coin cell battery provides power to the CMOS (Complementary Metal Oxide Semiconductorcomplementary metal oxide semiconductor) chip. Some signs of CMOS battery failure include: settings in the computer setup changing, the clock resetting, “Booting Error” messages, the laptop running slowly, or the laptop shutting down. | | | Prior to beginning this repair, be sure to [link|https://download.lenovo.com/pccbbs/mobiles_pdf/t480_ug_en.pdf#page=118|disable the internal battery], shut down the laptop, and disconnect from the external power source. |
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