Subaru key fob batteries are coin-cell types you can swap yourself in under a minute

Most Subaru key fobs use a CR2032 or CR2025 coin-cell battery that you can replace without tools or a trip to a dealer. The battery sits behind a removable cover on the back of the fob. You pry the cover open with a flat object — a coin, a flathead screwdriver, or even a fingernail — slide out the old battery, and drop in a new one. The whole process takes less than two minutes.

The exact battery type depends on your fob model and year. CR2032 is the most common across Subaru vehicles made in the last 15 years, but some older or specialty fobs use CR2025. If you are not sure which one your fob needs, check the battery compartment itself — the type is usually printed on the inside of the cover or on the battery holder.

You can buy replacement batteries at any pharmacy, grocery store, electronics retailer, or online. A single battery costs between $3 and $8. Some Subaru dealers will swap the battery for you at no charge, though this usually requires a visit during business hours.

Key Takeaways

  • Subaru key fobs almost always use CR2032 coin-cell batteries, which are sold at drugstores and supermarkets for $3 to $8 each.
  • You open the fob by prying the seam between the front and back halves with a coin or flat tool, then slide out the old battery and insert the new one.
  • The battery type is printed inside the fob cover, so check there if you are unsure whether you need CR2032 or CR2025.
  • If you do not want to do it yourself, most Subaru dealers will replace the battery at no cost, though you may need to schedule an appointment.

How to locate and open the battery compartment

The battery compartment on a Subaru key fob is on the back side. Look for a thin seam running horizontally across the back — this is where the front and back halves of the fob meet. The battery sits in a small circular holder just inside this seam.

To open the fob, insert a flat object — a coin works best — into the seam and gently twist or pry. You are not trying to force the fob apart; you are just creating enough space for the two halves to separate. Once they start to come apart, you can usually pull them the rest of the way by hand. Some fobs have a small notch or indent on the seam to make this easier.

If the fob is stuck, do not force it. Subaru fobs are plastic and can crack. Try a different spot along the seam, or use a plastic pry tool instead of metal if you have one. A plastic spoon or old credit card can work in a pinch.

Removing and replacing the battery

Once the fob is open, you will see the battery sitting in a circular metal holder. The battery is usually held in place by a small spring or just by friction. Gently pry the battery up with a fingernail or a flat tool — it should pop out easily. If it does not, try working from the edge rather than the center.

Before you insert the new battery, check the orientation. The side marked with a + (positive) should face up, toward the inside of the fob cover. The side marked with a − (negative) should face down, toward the metal holder. If you install it backwards, the fob will not work, but it will not damage anything — you just flip it and try again.

Drop the new battery into the holder and make sure it sits flat. Then press the two halves of the fob back together. You should hear or feel a small click when they snap into place. Test the fob by pressing a button — the LED light inside should flash, or you should hear the unlock sound from your car.

What to do if the fob still does not work after replacing the battery

If you installed a new battery and the fob is still dead, the battery may be defective or installed backwards. Pop the fob open again and check that the positive side is facing up. If it is, try a different new battery from a different package or brand — occasionally a battery from the shelf is dead on arrival.

If a fresh battery does not work, the problem is likely inside the fob itself. The circuit board, buttons, or internal contacts may be damaged or corroded. At this point, a replacement fob is usually cheaper than repair. Subaru dealers sell replacement fobs, and aftermarket fobs from retailers like Amazon or eBay are also available. Aftermarket fobs are typically $20 to $50 and still require programming to your car, which a dealer can do for $100 to $200.

If you have a spare fob that works, that is a sign the problem is with the fob itself, not your car. If neither fob works, the issue may be with your car's receiver, and you should contact a Subaru dealer.

When to replace the battery before it dies

You do not have to wait until the fob stops working to replace the battery. If you notice the fob is less responsive than usual — you have to press the button multiple times, or it only works from a shorter distance — the battery is weakening. Replacing it at this point prevents you from being locked out.

Subaru key fob batteries typically last three to four years with normal use. If your fob is older than that and you have not replaced the battery, it is worth doing proactively, especially before a long trip or winter weather when you might rely on the fob more.

Aftermarket versus OEM batteries

Aftermarket CR2032 and CR2025 batteries work just as well as OEM (original equipment manufacturer) batteries in Subaru key fobs. The difference is usually price and packaging. A generic CR2032 from a pharmacy costs $3 to $5, while a Subaru-branded battery from a dealer costs $8 to $12. The chemistry and performance are the same.

The main thing to check is the expiration date. Coin-cell batteries have a shelf life, and an old battery may not hold a charge. Buy from a retailer with good turnover — pharmacies and supermarkets usually have fresher stock than dollar stores. If you buy online, check the listing for the manufacture date or expiration date.

Frequently Asked Questions

Can I use a different battery type if I do not have a CR2032?

No. CR2032 and CR2025 are different sizes and voltages. Using the wrong type may not fit in the holder or may damage the fob's circuit board. Check the battery compartment to see which type your fob needs, then buy that exact type.

Do I need to reprogram my key fob after changing the battery?

No. Changing the battery does not erase the fob's programming. Once you install the new battery and close the fob, it should work when ready without any reprogramming steps.

What if I lose a screw or piece when I open the fob?

Most Subaru key fobs do not have screws — they snap together. If you do lose a piece, contact a Subaru dealer with your vehicle identification number (VIN) and fob model. They can order a replacement part or sell you a new fob.

Is it safe to open the key fob myself?

Yes. The fob contains no hazardous materials and no high-voltage components. The only risk is cracking the plastic if you force it too hard. Take your time, use a plastic tool if you have one, and stop if you feel resistance.

How long does a new battery last in a Subaru key fob?

A CR2032 battery typically lasts three to four years in a key fob, depending on how often you use it. Heavy use — pressing the button many times per day — can shorten the lifespan. Light use can extend it.