Duracell Coppertop Alkaline D Batteries (4-Pack) in the D Batteries department at Lowes.com
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