Welcome To K9 Battery!

Here you can find quality batteries that are guaranteed to fit your Invisible Fence® collar at a fraction of the price. Check out our NEW K9 Brand batteries at great introductory prices here! Still available are our Perimeter Brand batteries here!

Featured collection

  • Single Battery
    Vendor
    K9 Battery
    Regular price
    $13.99 USD
    Sale price
    $13.99 USD
    Regular price
    $17.49 USD
    Unit price
    per 
    Sold out
  • 2 Pack
    Vendor
    K9 Battery
    Regular price
    $19.99 USD
    Sale price
    $19.99 USD
    Regular price
    $24.99 USD
    Unit price
    per 
    Sold out
  • 4 Pack
    Vendor
    K9 Battery
    Regular price
    $37.99 USD
    Sale price
    $37.99 USD
    Regular price
    $47.49 USD
    Unit price
    per 
    Sold out
  • 6 Pack
    Vendor
    K9 Battery
    Regular price
    $55.49 USD
    Sale price
    $55.49 USD
    Regular price
    $69.49 USD
    Unit price
    per 
    Sold out
  • 8 Pack
    Vendor
    K9 Battery
    Regular price
    $71.99 USD
    Sale price
    $71.99 USD
    Regular price
    $89.99 USD
    Unit price
    per 
    Sold out

After having tried a few different brands of replaceable batteries, I've come to really like this product. The batteries are made from quality materials and they last what feels like forever. It doesn't hurt they're also cheaper in price than previous brands I've tried; so I intend to continue buying these.

Jessica S. Kelly

I've been looking for a quality replacement battery for some time so I'm glad I found these. I've tried others and have had nothing but trouble; some don't fit properly, some have loose contacts, no power longevity, etc. So far I am very happy with these, decent price, looks and feels to be quality materials, no problems with power at all. I will make these my preferred replacement.

Lou S.

Been using these for the past few weeks and honestly they’re performing just as well as the batteries I use to use at HALF the price! I will definitely be back for more.

Jay

Designed to Last

Cheaper Alternative

Save yourself some money and free yourself from that expensive Invisible Fence® Brand battery plan you are on from your local Invisible Fence® Brand dealer! We have batteries to fit your Invisible Fence® Brand collar as low as $8.00!  These batteries are guaranteed 100% compatible with your Invisible Fence® Brand R21, R22, R51, and MicroLite™ receiver. Our batteries batteries are an exact aftermarket replacement to the Invisible Fence® Brand Power Cap® battery.

Satisfaction Guarantee

We confidently stand behind our products and guarantee your 100% satisfaction. Rest easy knowing your investment is protected!

What About Shipping?

Domestic shipping is free! Shipping times depend on location, if you live down the street from us in Virgina, you'll get it faster than you would if you lived in Hawaii. The USPS site quotes, but does not guarantee, 2-8 business days for domestic delivery.