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Don't wait for the red light to replace your Invisible Fence® Power Cap® Battery. See how to check it, swap it out, and keep your pet's boundary active.
Published 1/27/2026
Updated 8/5/2026
Your pet's Computer Collar® Receiver depends entirely on a working Power Cap® Battery to function. If you're wondering whether the battery in your dog's collar is still good, or how to check it, here's what you need to know.
The simplest indicator that your Invisible Fence® Brand collar battery needs attention is a red blinking light on the Computer Collar® Receiver unit. If you notice this light, your Power Cap® Battery is running low and should be replaced as soon as possible.
Don't wait until the battery dies completely. A weakened battery may cause inconsistent performance before it fails entirely, which means your pet's boundary may not be fully reliable.
Invisible Fence® Brand recommends replacing the Power Cap® Battery every three months regardless of whether the red light has appeared. This proactive approach is the safest and most reliable way to ensure your pet's collar is always functioning at full strength.
Batteries last approximately 90 to 120 days under normal use, so a three-month replacement schedule keeps you comfortably ahead of any potential issues.
Replacing the battery is a straightforward process.
Always use a genuine Invisible Fence® Brand Power Cap® Battery. Third-party batteries may not fit correctly and can allow water into the collar unit, putting both the equipment, warranty, and your pet at risk.
If remembering to replace the battery every three months feels like one more thing to keep track of, the Power Cap® Battery Plan makes it easy.
Batteries are delivered on a schedule, so you always have a fresh one on hand. The plan also saves 15% compared to buying batteries individually and is compatible with all non-rechargeable Computer Collar® Receivers.
If you've replaced the battery and the red light continues, or if you're unsure whether your collar is functioning correctly, contact your local Invisible Fence® Brand dealer for assistance.
Our team can help diagnose any issues and make sure your system is working properly.
Checking your Invisible Fence® Brand collar battery is as simple as watching for the red blinking light. However, the best practice is to replace the Power Cap® Battery every three months on a regular schedule.
Use only genuine Power Cap® Batteries, and if you have any concerns about your collar's performance, call 1-800-578-3647 or visit your local dealer.
