Hyundai key fob batteries typically last three to four years and cost between $5 and $15 to replace

You can replace a Hyundai key fob battery yourself in about five minutes using a coin and a new battery — no tools or dealership visit required. The battery type varies by model year and fob design, but most Hyundai fobs use either a CR2032 or CR2025 coin cell battery, both widely available at drugstores, supermarkets, and online retailers.

The process is the same across nearly all Hyundai models: pry open the fob case, remove the old battery, insert the new one with the correct side facing up, and snap the case closed. If your fob has stopped working or the buttons respond slowly, a dead battery is almost always the cause.

Key Takeaways

  • Most Hyundai key fobs use a CR2032 or CR2025 battery, which you can buy at any pharmacy or grocery store for under $15.
  • You open the fob by inserting a coin into the slot on the side and twisting gently until the case separates into two halves.
  • The battery sits in a small metal holder; note which side faces up before you remove it, then install the new battery the same way.
  • If the fob still does not work after battery replacement, the problem is likely a worn button contact or internal damage, not the battery.

Identify your Hyundai fob type and battery size

Hyundai has used several fob designs over the years, but they all follow the same replacement principle. The easiest way to find out which battery your fob needs is to look at the back or side of the fob itself — many models have the battery type printed directly on the case. If you do not see a label, check your owner's manual under "Key Fob" or "Remote Control."

If you cannot locate the information, you can also open the fob and look at the battery itself once you have it apart. The battery type is stamped on the top. CR2032 is the most common size for Hyundai fobs made in the last 15 years, but some older models and certain trim levels use CR2025 or even CR2016. Once you know the type, buy a replacement battery of the exact same model number — do not guess or substitute.

Open the key fob case

Locate the small slot or seam on the edge of your fob. Most Hyundai fobs have a thin slot on one side where you can insert a coin. Insert a flathead coin (a dime or penny works well) into the slot and twist gently — do not force it. The case will separate into two plastic halves.

If your fob does not have a visible slot, look for a small button or latch on the back. Some models require you to press a release button while pulling the case apart. If you are unsure, try the coin method first on the side seam. Once the case opens, set the metal battery holder and spring aside carefully — they are small and straightforward to lose.

Remove the old battery and note its position

The battery sits in a small metal holder with a spring underneath it. Before you touch anything, look at which side of the battery faces up — this matters. The side with the + symbol should face either up or down depending on your fob design. Take a mental note or take a quick photo with your phone so you remember the orientation.

Gently pry the battery out of the holder using your fingernail or the edge of a coin. Do not use excessive force; the battery should come out easily. If it is stuck, try tilting the fob slightly so gravity helps. Once the old battery is out, you can discard it or recycle it at a pharmacy or electronics retailer.

Install the new battery and close the fob

Take your new battery and place it into the metal holder with the correct side facing up — match the orientation you noted from the old battery. The + symbol should face the same direction it did before. Press down gently until the battery sits flat in the holder and the spring underneath holds it in place.

Now align the two halves of the fob case and press them together firmly until you hear or feel a click. The seam should be tight with no gaps. Test the fob by pressing each button — you should see the LED light up, and your car should respond to the lock and unlock commands. If the buttons work when ready, the replacement is complete.

What to do if the fob still does not work

If you installed a new battery and the fob still does not respond, the problem is not the battery. The most common cause is worn button contacts inside the fob — the rubber pads that conduct electricity when you press a button wear out over time and can be replaced, but this requires opening the fob again and purchasing a contact pad kit (usually $10 to $20).

Another possibility is that the fob circuit board has failed or water has damaged the internal electronics. If your fob has been dropped, sat in water, or is very old, internal damage is likely. In this case, you will need to purchase a replacement fob from a Hyundai dealer or a third-party supplier. Dealer fobs typically cost $150 to $300 and may require programming at the dealership; aftermarket fobs are cheaper but vary in quality and compatibility.

Where to buy replacement batteries

CR2032 and CR2025 batteries are among the most common coin cell batteries made, so you have many options. Pharmacies like CVS and Walgreens stock them in the watch and battery section. Grocery stores including Walmart and Target carry them near the checkout or in the pharmacy. Amazon and other online retailers sell them in bulk packs, which is economical if you have multiple devices that use coin batteries.

Prices vary slightly, but a single battery typically costs $3 to $8 at a pharmacy and $1 to $3 per battery if you buy a pack of four or more online. Some Hyundai dealerships also sell batteries, but they charge a markup and you will pay more than buying retail. Stick with a major retailer or online seller to may support you get a genuine battery with a long shelf life.

Frequently Asked Questions

How do I know if my key fob battery is dead?

A dead battery usually causes the buttons to stop responding or respond very slowly. You may also notice the LED light on the fob is dim or does not light up at all when you press a button. If your car is parked nearby, try using the fob to lock or unlock it — if nothing happens, the battery is almost certainly dead.

Can I use a different battery size if I cannot find the exact one?

No. CR2032, CR2025, and CR2016 are different sizes and voltages. Using the wrong size can damage the fob or cause it to malfunction. Always use the exact battery type specified for your model. If you cannot find it locally, order it online — it will arrive within a few days.

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

No. Replacing the battery does not erase the fob's programming. Once you install the new battery and close the case, the fob should work when ready without any additional steps at the dealership or elsewhere.

What should I do with the old battery?

Most pharmacies and electronics retailers accept used batteries for recycling at no charge. You can also check Earth911.com or Call2Recycle.org to find a recycling location near you. Do not throw batteries in the trash.

How long does a new key fob battery last?

A new coin cell battery typically lasts three to four years in a key fob, depending on how often you use the fob. Heavy users may need to replace it sooner; light users may get five years or more from a single battery.