Amazon.com: EBL 1/2 AA Size 14250 ER14250 3.6V Lithium Batteries, 1200mAh High Capacity Batteries for Dog Collars and Baby Movement Monitor Alarm Systems and More (Non-Rechargeable) : Health & Household
Tadiran AA High Capacity 3.6 Volt Lithium Battery - Walmart.com
Lithium cell 1/2AA format 3.6V
File:Tadiran Israel TL-5151 3.6 Volt Lithium battery, half AA-4193.jpg - Wikimedia Commons
Amazon.com: 1/2 AA Size 3.6v Lithium Battery, ER14250 LS14250 1200 mAh Batteries Compatible for Dogwatch Dog Collar and Some of Movement Monitor/Home Security System/Alarm System - by TYRONE (16 Pack) : Health