• High Tech Pet Battery Replacement for the MS-4 and MS-5 collar keys
  • Compatible with MS-4 and MS-5 collar keys
  • Set includes 2 B3V1A batteries
  • Each battery lasts approximately 3 months
  • Easy, tool-free installation
  • Designed specifically for High Tech Power Pet Automatic Door Mount

High Tech MS-4 & MS-5 Collar Keys B3V1A-Replacement Batteries

Tool-Free Battery Swap For Ultrasonic Collar Keys

Regular price $34.99

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Engineered specifically for High Tech MS-4 and MS-5 collar keys, this tool-free replacement 2-pack snaps directly into place to restore instant door activation and maintain reliable hands-free access for your pet.

  • High Tech Pet Battery Replacement for the MS-4 and MS-5 collar keys
  • Compatible with MS-4 and MS-5 collar keys
  • Set includes 2 B3V1A batteries
  • Each battery lasts approximately 3 months
  • Easy, tool-free installation
  • Designed specifically for High Tech Power Pet Automatic Door Mount

Installation & Fit

  • Inserts into the rear battery compartment of High Tech MS-4 and MS-5 ultrasonic collar key fobs.
  • Features coin-slot or snap-lock cap access for tool-free DIY replacement in seconds.
  • Requires proper positive (+) terminal alignment against the internal contact clip during insertion.
  • Press-fits against the internal rubber O-ring seal to ensure the casing remains water-resistant upon reclosure.

Best Suited For

Ideal for:

  • Tool-Free Snap-In Maintenance: Quickly restoring instant door response with simple, tool-free battery replacement that snaps directly into the key casing in seconds.
  • Owners of High Tech MS-4 and MS-5 ultrasonic collar keys requiring replacement power.
  • Keeping a fresh spare B3V1A battery on hand in multi-pet households running several collar keys simultaneously.
  • Providing up to 3 months of continuous daily collar key operation per battery (6 months total operational power per 2-pack).

Questions

How do I measure my old flap to order the right replacement size?

Measure the flap panel itself, not the hole it covers and not the outside of the frame. Take the width across the flap at its widest point, then the height from the top edge, including the section that sits under the retainer, down to the bottom edge.

Then count the holes along the top edge and measure the distance between the centers of the two outermost holes. Flap dimensions repeat across brands but hole patterns do not, so that spacing is usually what tells us which flap is actually yours. The size guide on the product page lists the flap dimensions for each size we carry, so you can check your measurements against it before ordering.

Can I buy just one flap for a double flap pet door?

Yes. On a double flap door the two flaps are separate parts, so you can replace one and leave the other in place. That is common, because the exterior flap takes the weather and the UV and usually wears out first.

Order the same size as your door and tell us which side you need if the two differ. If both flaps are the same age it is worth replacing them together. A new flap sits against the frame more tightly than a relaxed older one, and mixing the two can leave the seal uneven.

Does a replacement flap come with magnets and hardware, or just the flap?

Our replacement flap kits arrive ready to install. The flap ships with the parts needed to fit it to your door, so you are not sourcing magnets, rivets or retaining strips separately.

If you would like to add extra magnets for a firmer close, those are available separately as well.

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Product Details

Product Details


The High Tech Pet B3V1A Replacement Battery 2-Pack keeps your MS-4 and MS-5 ultrasonic collar keys fully powered for continuous hands-free door access. Engineered for simple, tool-free installation, each battery provides up to 3 months of dependable energy for your pet's collar key.

Tool-Free Snap-In Maintenance
Designed for quick maintenance, these compact batteries snap directly into the collar key casing without requiring tools or complex disassembly. Replacing weak batteries promptly ensures your High Tech door responds instantly whenever your pet approaches.

Technical Specifications & Features:

  • Targeted Compatibility: Engineered specifically for High Tech MS-4 and MS-5 ultrasonic collar keys.
  • Long Operational Life: Each B3V1A battery delivers approximately 3 months of daily performance.
  • Convenient 2-Pack: Includes two replacement batteries to maintain a ready spare.
  • Collar Key Dedicated: Designed exclusively for collar keys, not intended to power the main door motor.

Looking to power your electronic door unit instead? Explore the High Tech battery charger and kit.

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Track heights exceeding 106 inches (107" or higher) may require additional shipping charges. Please provide your contact information for a custom freight quote, and our team will follow up during normal business hours.