PET Standard Replacement RFA-67 6V Lithium Batteries Compatible with PetSafe Battery-Operated Pet Products and Specific Dog Receiver Collars - RFA-67D-11 (Pack of 10)[Premium Quality Replacement] Equivalent to PetSafe Model RFA 67 collar batteries. 10 year shelf life. No mercury and Cadmium. [Compatibility] 100% compatible with PetSafe RFA 67 RFA 67D 11 batteries; never popping out or falling out from the collars. [Frequency Of Replacement] Battery modules are waterproof and last 1 3 months, depending on use. [Trusted Brand] Made by PET STANDARD for a Better Fit and Better Battery Life [Friendly Customer Service]