Amazon.com : 6 Volt Replacement Battery for Dog Shock Collar Compatible with PetSafe RFA-67 : Pet Supplies
PetStandard Replacement Batteries for PetSafe RFA-67 (Pack of 10) - Walmart.com
Amazon.com : PetSafe RFA-67 6 Volt Replacement Batteries - 2 Pack - Compatible with PetSafe 6V Lithium Battery-Operated Pet Products and Specific Dog Receiver Collars - RFA-67D-11, Black : PetSafe : Barking Deterrent Collars : Pet Supplies
Shop for 3-Volt Battery by PetSafe - RFA-188
Dog Collar Battery Petsafe RFA-67 Hack Battery Replacement - YouTube