PetSafe RFA-67D-11 6V Battery vs PetSafe RFA-188 3 Volt Replacement Battery

Both are PetSafe replacement batteries, but they fit different collars, so the choice is about compatibility, not quality. The RFA-67D-11 is the 6V pack for RFA-67 receivers and most PetSafe in-ground and wireless fence collars; it is rated higher and owners report it seating firmly with a coin twist. The RFA-188 is a smaller 3V CR1/3N cell for Little Dog fence receivers, cat fence receivers and select spray or vibration bark collars. Check your collar's battery compartment or manual before buying, because the two are not interchangeable.

• Choose the RFA-67D-11 if your collar takes a 6V RFA-67 battery, which covers most PetSafe in-ground and wireless fence receivers and several bark collars.
• Choose the RFA-188 if your collar takes a 3V CR1/3N cell, such as the Little Dog or cat fence receivers and some spray and vibration bark collars.