Xeno Energy XL-050F - 3.6V 1200mAh 1/2 AA Lithium Battery (50)
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
Interstate Batteries 3.6V 1200 MAH Lithium 1/2AA TEKCELL
AA-1/2-LI , half of AA size battery, 3.6V Lithium battery, Non-rechargeable.