Amazon.com: 10 Pack 4LR44 / PX28A / L1325 / A544 / K28A / 476A 6V Alkaline Batteries for Dog Shock/Training Collars by Loopacell, 5 Count (Pack of 2) : Health & Household
20-Count 4LR44 6V Battery,PX28A 476A A544 K28A L1325 Battery 6V Alkaline Batteries for Dog Training Collars Cameras : Amazon.ca: Health & Personal Care
Amazon.com: Bark Collar Batteries by GoodBoy 5-Pack 6V Alkaline Battery 4LR44 (Also Known as PX28A, A544, K28A, V34PX) : Health & Household