Amazon.com : GP Batteries Brand CR2 Lithium-Ion Battery Compatible with Some Electric Dog Fence Collars : Dogtek : Pet Supplies
Amazon.com: EBL CR2 Lithium Battery, 3 Volt 800mAh Photo Battery for Mini 25, Mini 50, Golf Rangefinder, Flashlight, Electronic Toys, Alarm Systems ( CR2-8 Count) : Health & Household