{"product_id":"perimeter-technologies-four-pack-batteries-for-invisible-fence-r21-r51-collars-4-pack","title":"Perimeter Technologies Four Pack Batteries for Invisible Fence R21\/R51 Collars (4-Pack)","description":"\u003ch2\u003eCompatible, cost-saving replacement for Invisible Fence collars\u003c\/h2\u003e\u003cp\u003eMeet Perimeter Technologies four-pack batteries, a cost-conscious replacement designed for Invisible Fence receiver collars. This pack covers popular models including R21, R22, R51, and Microlite, letting you swap in a ready-to-use power source without changing your existing setup.\u003c\/p\u003e\u003ch2\u003ePerformance you can feel on the collar\u003c\/h2\u003e\u003cp\u003eInside each battery sits a new and improved Japanese lithium-ion cell lineup, delivering higher energy density while keeping the collar lightweight. The result is a balance of dependable power and comfortable wear for active dogs during backyard training and daily walks.\u003c\/p\u003e\u003cp\u003ePerimeter Technologies builds with robust components to enhance durability and safety compared with standard batteries. When securely sealed in the collar, a tight rubber waterproofing seal helps protect the internals from moisture during rainy days or splashy play.\u003c\/p\u003e\u003ch3\u003eWhy this matters\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCost-effective option designed to replace existing batteries in compatible Invisible Fence collars.\u003c\/li\u003e\n\u003cli\u003eSeamless compatibility with R21, R22, R51, and Microlite models for easy upgrades.\u003c\/li\u003e\n\u003cli\u003eHigh energy density lithium-ion cells offer more power without adding bulk to the collar.\u003c\/li\u003e\n\u003cli\u003eQuality construction supports longer life and safer operation compared to typical batteries.\u003c\/li\u003e\n\u003cli\u003eWeather-ready waterproof sealing helps maintain performance in outdoor settings.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReal-world use and expectations\u003c\/h3\u003e\u003cp\u003eIn everyday life— from morning park runs to backyard training sessions—these batteries are built to perform when it matters. They aim to deliver steady power, minimize downtime, and provide a budget-friendly alternative for households with multiple collars.\u003c\/p\u003e\u003cp\u003eNote: Benefits described are potential improvements you may experience; actual results vary with usage and collar compatibility.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePotentially longer run times between replacements.\u003c\/li\u003e\n\u003cli\u003eLower total cost of ownership than using brand-name alternatives.\u003c\/li\u003e\n\u003cli\u003eSimple, tool-free installation to reduce maintenance time.\u003c\/li\u003e\n\u003cli\u003eConsistent power delivery that aligns with routine boundary management needs.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eBottom line\u003c\/h2\u003e\u003cp\u003ePerimeter Technologies four-pack batteries offer a practical, cost-aware option for keeping your Invisible Fence system running smoothly. By combining modern lithium-ion chemistry with durable design and a waterproof seal, they stand as a thoughtful replacement choice for busy dog households.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Which collars are compatible with the Perimeter Technologies four-pack?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: R21, R22, R51, and Microlite Invisible Fence receiver collars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What benefits might users notice?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: High energy density lithium-ion cells may extend run time and reduce collar weight for daily use.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Perimeter Technologies","offers":[{"title":"Default Title","offer_id":40563319767169,"sku":"B00BR0CA8M","price":87.61,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0598\/4757\/3633\/files\/perimeter-technologies-four-pack-batteries-packaging.jpg?v=1765830992","url":"https:\/\/petiva.ca\/products\/perimeter-technologies-four-pack-batteries-for-invisible-fence-r21-r51-collars-4-pack","provider":"Petiva","version":"1.0","type":"link"}