Lenovo CMOS BATTERIES
5B10W13980
is compatible in the following Models:
Lenovo ThinkPad X Series laptops
X1 Carbon 12th Gen (Type 21KC, 21KD) Laptop (ThinkPad) - 21KC0001CD
X1 Carbon 12th Gen (Type 21KC, 21KD) Laptop (ThinkPad) - 21KCCTO1WW
ThinkPad X1 2 in 1 Gen 9 (Type 21KE, 21KF) Laptop - 21KE001