Having a pack of replacement batteries on hand ensures your Perimeter dog collar is always working. And with a shelf life of over six years, you can trust they'll work as good as new when you need them! If you have a Perimeter Technologies dog fence, these 6-volt batteries are just what you need to keep your dog receiver collar functioning. Designed with lithium-ion technology, you can expect them to continue working for up to 6 months from the time you take the batteries out of the package and install them. With a shelf life of more than six years, you can keep several packs on hand and trust they'll work like new whether you need them weeks, months, or even years from now. Features: 6-volt lithium-ion technology Compatible with all Perimeter Technologies dog fence receiver collars Average Duration of Function: 6 months Shelf Life: 6 years or more Made in the USA with imported parts.