Lenovo Battery
5B10W51878
is compatible in the following Models:
Lenovo ThinkPad X Series laptops
ThinkPad X13s (21BX, 21BY) Laptop - 21BX0011AU
ThinkPad X13s (21BX, 21BY) Laptop - 21BXCTO1WW
ThinkPad X13s (21BX, 21BY) Laptop - 21BYS00000