These Invisible Fence® Brand compatible batteries were made by Radio Systems Corp. They now own both Invisible Fence® Brand and the PetSafe Brand products. Radio Systems Corp. produced these batteries right before they purchased Invisible Fence® last year. These batteries are no longer produced by Radio Systems Corp. When they are all sold, there will be no more at this great deal.

We have Invisible Fence® Brand compatible batteries to fit your Invisible Fence® Brand collar for as low as $8.75 each! These batteries are guaranteed to be compatible with your Invisible Fence® Brand R21 and R51 receivers produced any time in the last 8 years. These batteries are an exact aftermarket copy of the Invisible Fence® Brand Power Cap® battery.

The Battery Bottom Line: With our aftermarket Invisible Fence® Brand compatible batteries you could go a full six months for a fraction of the normal battery cost. If your receiver collar starts flashing the low battery light within the first 120 days, remove the battery for a minute or two and then reinstall it. The light should stop flashing, and you’ll be good to go for an extended period of time. All of our aftermarket Invisible Fence® Brand compatible batteries meet or exceed the original manufacturer’s specifications. The shelf life on these Invisible Fence® Brand compatible batteries is five years. Stock up on batteries now and save with our Free Shipping offer for orders over $50.00

Frequently Asked Questions

How long will each battery last in my Invisible Fence® collar?
Our batteries are guaranteed to last just as long or longer then you original Invisible Fence® Brand Power Cap® batteries. Customers report getting between 5 - 6 months, but this will vary based on your dog and yard.

How long are the batteries good for?
Our batteries have a shelf life of at least six years.

Are these batteries the same as Invisible Fence® Power Cap® batteries?
Our batteries are not manufactured by Invisible Fence®; rather they are exact aftermarket replacement batteries for the Power Cap® manufactured by Radio Systems Corp. (The company that owns the Invisible Fence Brand) Just like theirs, ours are lithium batteries. The voltage, size, and weight are the same.

Are your batteries made in China?
No, our batteries are manufactured in the USA!

What if I am not happy with your batteries? Can I receive a refund?
Sure, just return any used or new batteries within the first 7 days, and we will refund your complete purchase price.

OnLine SuperStore, LLP (retailer) do not represent that they are affiliated with the Invisible Fence ® company in any manner. The replacement batteries listed on this site are not Power Cap ® batteries, rather they are an aftermarket exact replacement for the Power Cap ® battery. Invisible Fence ® & Power Cap® are registered trademarks of the Invisible Fence, Inc.