Low-voltage cells or CR2 batteries are not widely used. Therefore you can’t find them in the market very often in comparison with popular cylindrical AA and AAA cells.
As most cylindrical batteries have 1.5V voltage, CR2 cells have 3V for lithium cells. This is the main distinctive feature in addition to its size.
LR2 size. Diameter 15.6 mm, length 27mm. I.e ...