Saft LS14250 - 3.6 Volt Primary Lithium 1/2 AA Battery - Saft # 700053
Amazon.com: EEMB ER14250 1/2AA 3.6V Lithium Battery Li-SOCL₂ Non-Rechargeable Battery XL-050F SB-AA02 LS14250 TL-5902 TL-2150 for Dog Collar Meter Sensor Movement Monitor/Home Security System/Alarm System : Health & Household