BBM supplies the Saft LS14250 Battery for the Renishaw OMP40-2 Kinematic Resistive Probe. This French made, Primary (non-rechargeable) Lithium Battery is an exact drop in replacement for the Original Equipment Manufacturers Battery. 

LS14250 Battery Specifications:
Battery Type: Cylindrical Cell
Voltage: 3.6 V
Capacity : 1200mAh
Chemistry: Lithium Thionyl Chloride (non rechargeable)
Size: 1/2AA
Terminal Type: Button Top