Vinnic L1325, RFA-18, A28PX, 4LR44, A544, PX28A, 4G13 6V Alkaline Battery for Dog Collars and Barking Control Systems - GN Batteries & Electronics Inc.
Exell Battery Rechargeable Alkaline L28PX Dog Collar Batteries in the Device Replacement Batteries department at Lowes.com
4LR44 6 Volt Alkaline Battery (A544, PX28A)
4SR44, 4LR44, PX28A, A544, 28A, K28A Battery Equivalents and Replacements