Perimeter Technologies Replacement Dog Collar Battery, compatible with Invisible Fence, R21, R22, R51, Microlite
Perimeter Technologies Replacement Dog Collar Battery, compatible with Invisible Fence, R21, R22, R51, Microlite
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Perimeter Technologies Replacement Dog Collar Battery, compatible with Invisible Fence, R21, R22, R51, Microlite

Where Perimeter Technologies Replacement Dog Collar Battery,... fits in your dog's day
Three short notes on who this product suits, how owners use it and what they keep an eye on, with your vet as the person to ask about health questions.
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1Who it's for
Owners who want everyday gear that fits their dog's size and makes walks, meals and rest at home simpler to manage.
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2How to use it
Compare the size or capacity details with your dog's measurements.
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3What owners notice
Owners look at how the item fits into the daily routine and how well it holds up after several weeks of regular use on walks, at meals and at home.
About this product
This replacement dog collar battery is a lithium-ion cell from Perimeter Technologies, made for Invisible Fence brand receiver collars. It fits the R21, R22, R51 and Microlite models and swaps in for the battery already in the collar. Seated under the collar's tight rubber waterproofing seal, the cell keeps the dog's electric fence collar lightweight.
Which collar models does this battery fit?
Check the model of the receiver collar before ordering. This battery is compatible with Invisible Fence brand collars in the R21, R22, R51 and Microlite versions. A collar outside those four models does not take this cell, and the battery is meant to replace the one already in a listed collar.
Lithium-ion cell and the waterproofing seal
The battery uses lithium-ion technology. Because it is a single cell rather than a pack of alkaline batteries, it keeps the dog's electric fence collar lightweight.
The cell remains waterproof once it is sealed inside the collar with a tight rubber waterproofing seal. That seal is part of how the battery sits in the collar, so it needs to be in place around the cell.
What reviewers say about the fit
Several reviewers mention that the battery fits well, and a few say it works as expected in their collar. Two reviewers report a short battery life, and two mention incompatibility issues with their collar. Three reviewers describe the battery as good value.
Questions about the replacement battery
Which Invisible Fence collar models take this battery?
The battery fits Invisible Fence brand receiver collars in the R21, R22, R51 and Microlite models.
Does the collar stay waterproof with this battery inside?
The battery remains waterproof when it is sealed within the collar using a tight rubber waterproofing seal.
What does the battery replace?
It replaces the current battery in the listed Invisible Fence collar models.
Does the battery add much weight to the collar?
The lithium-ion cell keeps the dog's electric fence collar lightweight.
- Compatible with Invisible Fence brand receiver collars
- Fits R21, R22, R51 and Microlite collar models
- Replaces the current battery in the listed models
- Lithium-ion technology
- Keeps the dog's electric fence collar lightweight
- Remains waterproof when sealed within the collar with a tight rubber waterproofing seal
What customers say
Customers find the battery reliable, working just as well as name-brand alternatives, and appreciate that it fits their collars perfectly and serves as a great replacement. However, the battery life receives mixed feedback - while some report it lasts over 4 weeks, others mention it dies within 2 weeks of use. Compatibility is also mixed, with some saying it works great with their invisible fence collar while others report it doesn't work with their specific model. Additionally, durability and indicator light performance receive negative feedback, with customers reporting the battery falling apart and the red light starting to blink.
Product details
| Brand | Perimeter Technologies |
|---|---|
| Product type | Dog collar battery |
| Department | Collars, Leashes & Harnesses |
| Sold by | DogJointly, operated by YALEO LLC |
| Delivery | Free standard US delivery, usually 7 to 14 business days after 1 to 3 days to prepare |
| Returns | 30 days on unopened items in their original packaging, with damaged or wrong items covered at our cost |
Delivery and tracking
Standard delivery is free to every US address, we prepare orders in 1 to 3 business days, delivery usually takes 7 to 14 business days, and the tracking link arrives by email when the parcel ships.
Returns and refunds
You can return unopened items in their original packaging within 30 days of delivery. Damaged, faulty or wrong items are replaced or refunded at our cost, so please read the refund policy and contact us before you send anything back.
How Subscribe and Save works
Choose the subscription option above the cart button to receive this product on a regular schedule at the lower subscription price. You can skip a delivery, change the schedule or cancel from your account or by writing to support@dogjointly.com.
Multi-buy savings
Pick 2, 3 or 4 units in the quantity cards to save 10, 15 or 25 percent on the item price. The saving is shown in the cart before checkout, so you can compare the total with a single unit.
Labels, ingredients and your vet
Ingredient lists and serving tables can change between batches, so the label on the pack you receive is the reference to follow. Please ask your vet before starting a supplement, especially for a senior dog or a dog on medication.
Questions about this product
Is Perimeter Technologies Replacement Dog Collar Battery, compatible with Invisible Fence, R21, R22, R51, Microlite available in the United States?
Yes, it is in stock at DogJointly and ships free to US addresses, usually within 7 to 14 business days after 1 to 3 days to prepare.
How should I compare Perimeter Technologies Replacement Dog Collar Battery,... with similar products?
Compare the brand, format, serving table and pack size in the details above with similar items in Collars, Leashes & Harnesses, and check the choice with your vet.
Where can I find delivery and returns information?
Delivery and returns are summarised on this page and set out in full in the shipping and refund policies linked in the footer of every page.
Guides and order help
Reading that helps you compare products, plus the pages that answer delivery and return questions.










