When training your pet, consistency is always key. Continue teaching your pet not to bark at the neighborhood squirrel and keep them safe in their backyard by making sure their collar never loses battery power. The RFA-67 6-Volt Replacement Battery will last approximately 1-3 months, depending on how frequently your dog uses their bark, in-ground or wireless fence collar. Your pet deserves the best. Trust PetSafe® to keep your pet healthy, safe and happy.