Amazon.com: 10x 4LR44 6V Dry Alkaline Batteries for Dog Training Shock Collars A544V 4034PX L1325 28A 4AG13 : Pet Supplies
Set of 5 batteries for 4LR44 Alkaline 6V Bark Collar
Vinnic L1325, RFA-18, A28PX, 4LR44, A544, PX28A, 4G13 6V Alkaline Battery for Dog Collars and Barking Control Systems - GN Batteries & Electronics Inc.
4LR44 6 Volt Alkaline Battery (A544, PX28A) | Walmart Canada