Tekcell 3.6V 1.2AH Lithium Batteries 1/2 AA - Walmart.com
Amazon.com: tyrone 1/2 AA Battery, Saft Ls14250 3.6v Battery 1200 mAh ER14250 Non-Rechargeable Lithium Batteries for Dog Collars and Baby Movement Monitor Alarm Systems and More [ 6 Pack ] : Health & Household