A laptop backup battery (CMOS, or complementary metal oxide semiconductor) is a small cell that is used to preserve system settings like time, date, boot order and hard drive type, even when the computer is powered off. IBM (Lenovo) Thinkpad backup batteries are easy to replace, thanks to the detailed assembly guides and user's manuals that are provided by IBM for each of their laptop models.
Refer to the user's manual for your particular IBM Thinkpad (see resources) to determine what kind
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