--- product_id: 3896984 title: "Perimeter Technologies Four Pack Dog Fence Batteries for Invisible Fence R21 or R51 Receiver Collars (4-Pack)" brand: "perimeter technologies" price: "€ 76.14" currency: EUR in_stock: true reviews_count: 8 category: "Perimeter Technologies" url: https://www.desertcart.gr/products/3896984-perimeter-technologies-four-pack-dog-fence-batteries-for-invisible-fence store_origin: GR region: Greece --- # 1.55V high energy density waterproof sealed design 4-pack lithium-ion power Perimeter Technologies Four Pack Dog Fence Batteries for Invisible Fence R21 or R51 Receiver Collars (4-Pack) **Brand:** perimeter technologies **Price:** € 76.14 **Availability:** βœ… In Stock ## Summary > πŸ”‹ Power your pet’s freedom with unbeatable reliability! ## Quick Answers - **What is this?** Perimeter Technologies Four Pack Dog Fence Batteries for Invisible Fence R21 or R51 Receiver Collars (4-Pack) by perimeter technologies - **How much does it cost?** € 76.14 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/3896984-perimeter-technologies-four-pack-dog-fence-batteries-for-invisible-fence) ## Best For - perimeter technologies enthusiasts ## Why This Product - Trusted perimeter technologies brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Reliable Power Boost:** Keep your Invisible Fence collars energized with long-lasting lithium-ion batteries designed for R21, R22, R51, and Microlite models. - β€’ **Trusted by Thousands:** Over 3,600 positive reviews prove these batteries deliver dependable power and peace of mind for pet owners. - β€’ **Lightweight & Compact:** At just 3.2g per battery, maintain collar comfort without adding bulk or weight to your dog’s gear. - β€’ **Waterproof Durability:** Sealed with a tight rubber waterproofing seal to withstand outdoor elements and keep your pet safe rain or shine. - β€’ **Cost-Effective Replacement:** Save up to 80% compared to original Invisible Fence batteries without compromising on performance or safety. ## Overview Perimeter Technologies Four Pack Dog Fence Batteries are premium lithium-ion replacements compatible with Invisible Fence R21, R22, R51, and Microlite collars. These lightweight, waterproof batteries deliver 1.55 volts of sustained power, ensuring your pet’s containment system runs smoothly. Offering superior durability and safety at a fraction of the original cost, they are a trusted choice among thousands of satisfied pet owners. ## Description desertcart.com: Perimeter Technologies Four Pack Dog Fence Batteries for Invisible Fence R21 or R51 Receiver Collars (4-Pack) : Pet Supplies Review: Great Price - Works as well as Invisible Fence batteries for 1/5 the price Review: back again - Had used perimeter batteries for a few years and had no issues. Tried to save a couple of bucks on another brand that seemed to have decent reviews. First couple of them seemed ok, but then life battery life became shorter and one of the batteries actually apart before inserting. I am back to my old reliable perimeter batteries. Well made and dependable. Still way less than invisible fence battery prices, they are a bargain! ## Features - 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. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00BR0CA8M | | Antenna Location | Invisible Fence brand receiver collars, specifically the R21, R22, R51, and Microlite models | | Battery Cell Composition | Lithium Ion | | Battery Cell Type | Lithium Ion | | Battery Weight | 3.2 g | | Best Sellers Rank | #7,718 in Pet Supplies ( See Top 100 in Pet Supplies ) #6 in Dog Wireless Fences | | Brand | Perimeter Technologies | | Compatible Phone Models | Invisible Fence R21 or R51 Receiver Collars | | Customer Reviews | 4.3 out of 5 stars 3,672 Reviews | | Item Dimensions | 2 x 4 x 4 inches | | Item Weight | 9.07 g | | Manufacturer | Perimeter Technologies | | Model Number | IFA-001-4 | | Number of Batteries | 4 Lithium Metal batteries required. | | Recommended Uses For Product | Invisible Fence brand receiver collars, specifically the R21, R22, R51, and Microlite models | | Reusability | Single Use | | UPC | 617529331180 | | Unit Count | 4 Count | | Voltage | 1.55 volts | ## Product Details - **Number of Batteries:** 4 Lithium Metal batteries required. - **Brand:** Perimeter Technologies - **Battery Cell Composition:** Lithium Ion - **Recommended Uses For Product:** Invisible Fence brand receiver collars, specifically the R21, R22, R51, and Microlite models - **Unit Count:** 4.0 Count ## Images ![Perimeter Technologies Four Pack Dog Fence Batteries for Invisible Fence R21 or R51 Receiver Collars (4-Pack) - Image 1](https://m.media-amazon.com/images/I/61yUrVgEdLL.jpg) ![Perimeter Technologies Four Pack Dog Fence Batteries for Invisible Fence R21 or R51 Receiver Collars (4-Pack) - Image 2](https://m.media-amazon.com/images/I/41K+6lRBS1L.jpg) ![Perimeter Technologies Four Pack Dog Fence Batteries for Invisible Fence R21 or R51 Receiver Collars (4-Pack) - Image 3](https://m.media-amazon.com/images/I/61XXmXFDOQL.jpg) ![Perimeter Technologies Four Pack Dog Fence Batteries for Invisible Fence R21 or R51 Receiver Collars (4-Pack) - Image 4](https://m.media-amazon.com/images/I/318AgrtLYJL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Is Invisible Fence's #3V PCP power cap the same power cap as these being sold?** A: No, these are an off-brand replacement. The design is different, resulting in inconsistent fit. **Q: Will these work on Microlite collars as well?** A: I don't know. I have the Invisible Fence brand fence and the collars have Invisible Fence on the receiver. The batteries work well with them but that's the only experience I have. Sorry. **Q: I have a perimeter technologies invisible fence r21 replacement collar - the battery in the picture looks different, will this battery work?** A: I have the Invisible Fence brand and these replacement batteries work great. These batteries are round and just pop in. I believe they will work just fine for you. **Q: What is the shelf life of these batteries?** A: I ordered one package of 4 in November 2021 and they lasted us until July 2022, we ordered the same product in July 2022 since they worked so well, but the most recent package the batteries are lasting about two weeks. We’ve already gone through 3 and our dog is running amuck in the neighborhood. I have a feeling we just got a bad lot. Will try one more time…. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great Price *by V***R on July 28, 2026* Works as well as Invisible Fence batteries for 1/5 the price ### ⭐⭐⭐⭐⭐ back again *by G***4 on April 17, 2024* Had used perimeter batteries for a few years and had no issues. Tried to save a couple of bucks on another brand that seemed to have decent reviews. First couple of them seemed ok, but then life battery life became shorter and one of the batteries actually apart before inserting. I am back to my old reliable perimeter batteries. Well made and dependable. Still way less than invisible fence battery prices, they are a bargain! ### ⭐⭐⭐⭐⭐ Great replacement part *by 4***2 on August 15, 2026* Great replacement battery for Invisiable Fence collar ## Frequently Bought Together - Perimeter Technologies Four Pack Dog Fence Batteries for Invisible Fence R21 or R51 Receiver Collars (4-Pack) - Invisible Fence Power Cap Battery; Battery for (2-Pack) Electric Collar Batteries for Dog Collars Original Brand Product, Dog Collar - Enerpe Dog Fence Batteries Long-Lasting & High Capacity Compatible with Invisible R21 R22 R51 and Microlite Fence Receiver Collars 8-Pack --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.gr/products/3896984-perimeter-technologies-four-pack-dog-fence-batteries-for-invisible-fence](https://www.desertcart.gr/products/3896984-perimeter-technologies-four-pack-dog-fence-batteries-for-invisible-fence) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-08-28*