Store New Arrivals Add to Favorite View Feedback Contact Four Pack Dog Fence Batteries for Invisible Fence R21 Or Description Unit Count 4.0 Count Battery Cell Composition Lithium Ion Item Weight 0.634 ounces Batteries 4 Lithium Ion batteries required. (included) Number of Batteries 4 Lithium Ion batteries required. (included) Package Dimensions 5.35 x 2.99 x 0.98 inches Compatible Phone Models R51 Receiver Collars, Invisible F Perimeter Technologies offers a cost-effective solution by providing a compatible replacement battery designed for Invisible Fence brand receiver collars, specifically the R21, R22, R51, and Microlite models. Perimeter Technologies has innovatively engineered a battery to seamlessly replace your current one in the collar models listed above. These batteries incorporate advanced lithium-ion technology, boasting a superior energy density while keeping your dog's electric dog fence collar lightweight. Equipped with robust components, this battery delivers extended durability and enhanced safety features compared to standard batteries. It also remains waterproof when securely sealed within your collar using a tight rubber waterproofing seal. Perimeter Technologies saves you money with your compatible replacement batteries for Invisible Fence brand receiver collars. Why pay the hefty prices of their batteries when you can buy a brand you can rely on for much less? Perimeter Technologies has designed a battery that will replace your current battery perfectly in R21, R22, R51, and Microlite models. With much effort placed in the making of your batteries, it is guaranteed you will get a great life expectancy out of your collar. Perimeter Technologies Batteries consist of a New and Improved Japanese cell lithium-ion and have a high energy density, also keeping the weight down from your dog's collar. With the components that make up this battery, it gives the power to last longer and has better safety factors than the normal battery. Bring confidence that your collar will last and go easy on your pocket by purchasing your battery. ABOUT US We offer the best prices around on high quality products. Our E-store includes media such as books, movies, music and games while offering electronics, toys, sporting apparel, clothing, tools, general home, garden items and more. SHIPPING We are always working hard to ensure your package arrives as soon as possible. Please understand that some factors like weather, high postal traffic, and the performance of shipping companies are outside of our control. RETURNS We offer a 30-Day Return Policy on items which you are not completely satisfied with. You have the option for a full-refund or an exchange of the item. PAYMENT We accept PayPal. CONTACT US This page content is yet to come Please ad us to your favorite seller and visit again later Thank You CUSTOMER SATISFACTION We try our very best to make sure every customer is completely satisfied. If there's a problem, message us! We're happy to help.