PetSafe, SportDOG and Invisible Fence Brand sell their own replacement batteries for fence and bark collars, while the Garmin, Dogtra and E-Collar Technologies collars listed here run on rechargeable packs.
Who made the collar?
Which collar?
The battery it takes
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Fence collars and training collars
Dog collar batteries by kind of collar
Collar
Battery
Who fits it
PetSafe fence and bark collars
RFA-67 cap, 6 V
You, with a coin or the Test Light Tool
SportDOG SDF-R fence collar
9-volt
You
SportDOG SDF-CTR Contain + Train
Rechargeable, from a kit
You, with the kit
Invisible Fence Computer Collar
Power Cap, 3 V
You
Garmin Alpha TT 25, Delta XC
Rechargeable lithium-ion
Replaceable, Garmin says
Dogtra receivers
Rechargeable Li-Po
Dogtra’s repair center, for warranty
E-Collar Technologies ET-300, ET-302
Rechargeable Li-Po
See the manual: it says both
From each maker’s own pages and manuals. Other collars may differ.
Changing a PetSafe cap
Before you begin, remove the collar from the pet.
Turn the old battery counterclockwise to the Unlock symbol, with PetSafe’s Test Light Tool or a coin.
With it out, hold the collar’s power button for 10 seconds, or until the lights and beeps stop, to clear the battery memory.
Look inside the collar for corrosion before the new cap goes in. If there is any, PetSafe says to contact its Customer Care.
Battery capturn it counterclockwise
The PetSafe battery and its cap come out as one piece: a coin in the slot turns it counterclockwise to the Unlock mark.
Sealed collars
SportDOG’s support article on changing a collar battery says to take out both screws on the back with a 3/32 hex key, fit the new gasket from the kit so the collar stays waterproof, then pair the remote and collar again.
E-Collar Technologies’ ET-300 manual gives steps for replacing the battery, but its safety section says only qualified service personnel should replace it, with the correct battery.
Batteries that only one maker sells
Invisible Fence Brand says its Power Cap is the only battery authorized for its Computer Collar while under warranty. Most of these packs carry the maker’s own part number, so search by that number.
Common questions
How long does a fence collar battery last?
PetSafe gives 1 to 3 months for its RFA-67, depending on use, and Invisible Fence Brand 90 to 120 days for its Power Cap.
Can I charge a Garmin dog collar in the cold?
Only above freezing: Garmin's Alpha TT 25 manual gives a charging range of 0° to 40°C (32° to 104°F).
From PetSafe, SportDOG, Invisible Fence Brand, Garmin, Dogtra and E-Collar Technologies product pages, manuals and support articles, read on October 25, 2026. Checked against published data from SportDOG, PetSafe, Garmin, Invisible Fence Brand and Dogtra (plus 1 more).
PetSafe support, How to Replace the Battery in a Stay & Play with Replaceable Battery Collar
SportDOG, Replacement 9-Volt Battery for In-Ground Fence Collar (SDF-R)
SportDOG, Receiver Battery Kit (SDF-CT)
SportDOG support, How to Change Your SportDOG Collar Battery
Invisible Fence Brand, Batteries and Power Cap Battery (Single)
Garmin, Alpha TT 25 Owner's Manual: Dog Collar Device Specifications
Garmin, Delta XC Series Owner's Manual (PDF) and Lithium-ion Battery (Delta Series Dog Collars)
Dogtra replacement receiver batteries: BP37P3303P, BP74R3P, BP74RS3P, BP37P2803P and BP37Y3P
E-Collar Technologies, ET-300/302 Mini Educator owner's manual (PDF)
Battery sizes come from battery makers' datasheets and device makers' own manuals and help pages. Check your device's manual or the old battery before you buy. If anyone may have swallowed a battery, call the National Battery Ingestion Hotline at 1-800-498-8666 or your poison center at 1-800-222-1222 straight away.
