Tadiran SL-750 1/2 AA Lithium Thionyl Chloride Battery (1 Pack)
5 x Saft LS14250 Batteries 1/2AA Size 3.6V
EEMB ER14250 LS14250 1/2AA 3.6V 1200mAh Lithium Battery half aa batteries Li-SOCL₂ Non-Rechargeable Battery for Dogwatch Dog Collar and Some of Movement Monitor/Home Security/Alarm System (10): Amazon.co.uk: Electronics & Photo